Ports and Compilation Appearances
Following the example of its predecessor, Sonic 2 has been ported to almost as many different platforms ranging from collection disks or downloadables on newer consoles, to arcades and mobile devices. Many are more or less identical emulations, but some vary. It is important to note however that the Game Gear "version" of Sonic the Hedgehog 2 is in no way related to this game at all, other than the name. The Game Gear title was released around a month earlier, but unlike the 16-bit and 8-bit versions of Sonic 1, which have some similarities, the overall concept of the game and all of the levels differ completely. The two Sonic 2's should therefore be taken as separate sequels to their respective Sonic 1's. However, one handheld game that is, for all intents and purposes, a kind of adopted child of Sonic 2 is Sonic Pocket Adventure, released for the Neo Geo Pocket, much later on in 2000. Although borrowing music from Sonic 3 and Sonic & Knuckles and making up its own level names and layouts, the visual styles of Emerald Hill, Chemical Plant, Aquatic Ruin, Casino Night, Sky Chase and Wing Fortress (plus Scrap Brain from Sonic 1) are all dumbed down a bit for the lower resolution, but still present and correct.
Sonic Pocket Adventure is made as a kind of watered down Sonic 2, here with Casino Night, err, I mean.. 'Cosmic Casino'.
Chemical Plant becomes 'Secret Plant' in Sonic Pocket Adventure.
The earliest straightforward port of the Mega Drive Sonic 2 came in the shape of the classic coin-op arcade, specifically the Mega Play and Mega Tech Sega arcade machines, which ran ports of several of their console titles. As with the Sonic 1 arcade game, on the Mega Tech, the only difference is the fact that a time limit is constantly inhibiting your progress through the game, which is set back by three minutes for every coin you insert. On Mega Play however, there is no time limit or even a timer in the top left corner whatsoever, and you can play as much as you like. However, all Special Stage access has been blocked by the removal of the stars that appear above checkpoints, and to ensure that you meet your end much quicker than usual, all extra lives have been replaced by ten-ring items. All zones and acts are present and correct however, although at the title screen, there is no other option than to start the game as Sonic and Tails. Unlike Sonic 1, there is no scoreboard.
The title screen of the Mega Play Sonic 2 arcade game. You can only insert your coins and start as Sonic and Tails.
Note the lack of any timer at all in Mega Play.
In 2006, Sonic 2 again followed in the footsteps of Sonic 1 by appearing, pre-installed on Panasonic mobile phones in Japan. A few months later, a new version was released on a later phone model which featured an enhanced title screen and an "attack" mode, putting the player through a sequence of Special Stages or boss battles. The mobile version that we'll all be more acquainted with however is "Sonic 2 Dash", or just "Sonic Dash" which was released over on Western shores in April 2008, published by Glu who, at the time of writing, have a demo available to play online. The game is too big to squeeze onto a mobile in one go (or perhaps it isn't, and they want to make more money, hmm..), so only the first five zones are playable, with the remaining five and Death Egg to come at a later date, assuming it again follows the example set by Sonic 1. Conflicting media appears to portray two versions of the game, one that features exactly the same graphics that we're used to, with both Sonic and Tails, and another whose levels suffer toned down foregrounds and plain colour backgrounds, without Tails present. Perhaps this is relative to you're phone's capabilities? In either case, your HUD is now placed outside of the game window in a green bar area. Buttons 4 and 6 move left and right, button 2 is a straightforward jump, while buttons 1 and 3 are jumps that are automatically combined with the left/right buttons accordingly. 5 looks up, and also selects options, 8 looks down and rolls Sonic in a ball while moving, and 7 and 9 correspond to the down button combined with left/right. The initial title screen menu offers self-explanatory Instructions, Hi-Scores and Options (for European languages, difficulty and volume) menus. Selecting to start the game allows you to play either from the beginning or to pick one of the zones available.
Title screen for the 2008 model, Sonic 2 Dash.
The higher resolution design.
The lower resolution - note the lack of background.
Xbox Live Arcade
On 12th September 2007, Sonic 2 was hot on the heels of the original once more by making an appearance on Xbox Live arcade, the Microsoft Xbox 360 downloadable games service, for 400 points (or a free one-level demo). The title screen and demo sequence occurs only within a small window on the screen, while you select your options next to it, thereby preventing the level select cheat from being activated. Fortunately you can save and load the state of the game at any time into one of three save slots, and extra options include the ability to enable or disable graphic smoothing, and adjust the size and stretching of the game on the screen. Custom controls can also be set, and when starting a new single player game, you're given the option of which character(s) to play as. Multiplayer mode is also available, featuring a co-op mode that is exactly the same as the 1 player game, but allows a second player to take control of Tails (which isn't possible otherwise, even though you can still play as Sonic and Tails in single player).
There are online leaderboards for all scores (which you won't get very high on, as there are too many people who are too bloody good at this game), but the real feather in this version's cap however is an exclusive over any other, and a first for the entire series - online play. Yes, beating Sonic Rush Adventure to it by a mere two days, this version of the game earns the title of first ever Sonic game to officially (not counting pre-existing fan-made modifications) be played online against other users. The 2 player versus mode can be played over Xbox Live by selecting said option from the multiplayer mode list, although its ability to keep up without lag or control delays appears to depend on the strength of the user's internet connection. You can choose to play against anyone or have a ranked match, which I assume pits you only against the elite of the scoreboard, or something like that. Then, setting up online matches can be done by choosing Create Match, where appropriate options such as items, level and mic are selected and you simply wait for another Sonic fan to come along and join you. You'll be Sonic, they will be Tails. You can be the one who joins another's match by selecting Quick Match or Custom Match, where you can specify the appropriate options that you want to play by, and a search for relevant games will be conducted.
Also, twelve achievements offer a number of Gamerscore points to add to your Xbox profile. These include 5 G's for clearing Emerald Hill Act 1 plus 15 for doing so in less than 35 seconds, 20 for passing Chemical Plant Act 1 in under 45 seconds, and 10 for getting to Casino Night. Earning one Chaos Emerald supplies you with 10 G's, and get all seven for 40. You get 20 G's when you transform into Super Sonic, while staying in that form for at least a minute earns another 20. Earn 5 by just playing all of the multiplayer levels, and 10 Gs are given by collecting 10 wins in multiplayer over Xbox Live. Finally, 35 G's are up for grabs by completing the game, with an additional 10 for doing it in less than an hour.
#1. Comment posted by Kabam! on Thursday, 27th June 2013, 4:02am (BST)
I don't understand! Am I literally the only person on Earth who knows about the port of Sonic the Hedgehog 2 to the blackberry torch? I can't even find footage of it on Google for goodness sakes! It is a very interesting port which I believe deserves more attention, but no one else on Earth has any idea that this port exists!
#2. Comment posted by Kabam! on Thursday, 27th June 2013, 4:05am (BST)
Just in case, the blackberry torch is AT&T. I'm not sure if that would make a difference, but I'm just making sure.
#3. Comment posted by Sonic Hinter on Friday, 7th April 2017, 10:15am (BST)
There is also a sonic 2 port made by Christian Whitehead.
Hide Notes
Sonic 2 Beta and the Lost Zones
It's been well documented on the internet that a number of ideas were put into Sonic 2 during development, many that didn't see the light of day. Names and media of many levels that were planned for the game, but dropped somewhere down the line have surfaced through developer interviews, early playable versions of the games and development notes and sketches. One of the most prominent is a theory that Sonic 2 stages were actually planned to have past and future versions, much like those that were featured in Sonic CD, Ohshima's alternative, fully Japanese sequel to Sonic the Hedgehog. Perhaps the biggest insight into Sonic 2's world of forbidden pleasures came in the late 90's, when an unfinished, barely playable beta ROM of the game was discovered on a Chinese website by Simon Wai, containing all sorts of unused content and levels that did not feature in the final Sonic 2. In an interview with website Gamespy in 2005, Sonic 2 lead programmer and "Father of Sonic" Yuji Naka happened to casually mention that a beta of the game was once stolen from a Sega demonstration at a New York toy show in mid-'92, and it's believed that he was talking about the original cartridge that this discovered beta could have come from, which then supposedly went on to be sold by pirates (probably not the "yarr" kind) under the unfortunate misguidance that it was the complete version. Thanks to the wonder of emulation and hacking and stuff, this little gem was let loose across the whole online Sonic world, leaving a rather large dent of notoriety in it.
The beta contains many levels, both familiar and otherwise, and their degree of completion varies a great deal, with some being very similar to their final version counterparts, while others carry completely different graphics or layouts. The game isn't designed to be fully playable, and the production of some of the later and unheard of stages hadn't even been started, it would seem. The correct character physics had largely been established, though bugs and glitches do still appear, such as Tails' ability to lose your rings when hit. If you can get a hold of the beta ROM and play it on an emulator, press A and start on the title screen to open up the level select menu, where you'll be able to access all of the proposed levels in their varied states of completion (some of which have different names to their final versions). Additionally, for debug mode, press C four times, then up, down four times, up, then A and start at the title screen. Select a level and hold A while pressing start. Levels include:
The title screen for Sonic 2 beta. Compare and contrast with the final.
Green Hill Zone (Emerald Hill)
Wood Zone
Metropolis Zone
Hill Top Zone
Hidden Palace Zone
Oil Ocean Zone
Dust Hill Zone (Mystic Cave)
Casino Night Zone
Chemical Plant Zone
Genocide City Zone
Neo Green Hill Zone (Aquatic Ruin)
Death Egg Zone

Whoa! That's a pretty different roster, eh? Lets have a looksie at some of the new boys..
Hidden Palace Zone
The name was also used for a short, story-driven level in Sonic & Knuckles, but it was originally found here. Sega released a lot of Sonic 2 media to the public alongside development to help hype it up, and this level appeared in numerous screenshots. Having seen these shots, some players were disappointed to find this cool-looking underground water cavern zone absent from the final version of Sonic 2, and made it known to the content-cutters behind this unpopular decision. Hearing their cries of concern, Sonic Team squeezed the level into Sonic & Knuckles a couple of years later, but as you can see from these screenshots, the resemblance is not entirely uncanny, despite being based on similar location types. In the interview mentioned earlier, Yuji Naka claimed that the team simply ran out of time to finish it off, and it just had to be cut. It's difficult to know where it would fit, as a similar cave level (Mystic Cave Zone) already exists in the final game, although he also goes on to claim that the level would have been accessed once Sonic gained all seven Chaos Emeralds. Supposedly, Hidden Palace would have been where the emeralds came from, and also where Sonic would be granted his Super Sonic ability. The moral is therefore to blame Sega management for avoiding delays and forcing it out before completion (a crime that, years later, they are still doing with much worse affects).
Fortunately however, Hidden Palace Zone, in its original glory does appear in Sonic 2 beta in a noticeably more complete and playable state than its fellow lost levels. There is one act, and you can only play it so far before being stopped by a large, mysterious green emerald blocking a tube, but all the graphics seem to be near enough complete. A lot of research has been put into this level since discovery, and it's been found that it was probably so close to completion that some distorted traces of it can even be found hidden deep within inaccessible regions of the final game. It even has its own music, which you can find in the Sound Test as track number 10. Originally thought to be an unused tune, this is now heavily believed to be the background music intended for Hidden Palace Zone. The music used for it in the beta version, however, is completely different, and would become the tune for the 2 player versus version of Mystic Cave Zone in the final game, which I prefer, personally.
Hidden Palace is a shiny, underground paradise with waterfalls, jewels and golden pathways.
A winding tube brings Sonic to a lower area near the start of the stage, although normally he would be spinning through these.
The bridges light up as Sonic passes over them.
A step-based structure is also present.
Hidden Palace is a colourful affair with ground made of golden crystals, straight gold platforms for surfaces, and crystal pillars of green, purple and gold, complete with glowing circles. The background is made up of rows of more purple and blue crystal rocks and through them are beautiful waterfalls cascading down throughout this jewel encrusted cave. The structure is fairly enclosed, with tunnels and passageways, and the ground is very step-based. There's water looming along the bottom of the level, long, twisting green pipes to add speed, and check out those cool green bridges, which light up as Sonic walks over them. The only real objects around are crumbling platforms and a couple of level-exclusive badniks not seen in the final game.
Unnamed bat and dinosaur badniks.
You won't find either of these badniks in the final Sonic 2. The bat flaps around near the ceiling until you come along, where he swoops down in a semi-circular path towards you and returns to the ceiling. The red dinsoaur bot does little but trundle back and forth over a set area. After killing them, these badniks will reappear if you leave the area and come back.
Something that they would never have kept for the final game, in order to get down to the platform just below, you have to drop off the edge to the left very carefully so that you can just hang onto the one directly below. Fall off, and it's death for you.
Very carefully drop off of this edge and quickly turn back in as you fall. Odd.
And then you come to this. The ultimate icon for anything involving Sonic mysteries. It appears as though this big green emerald (probably not supposed to be the Master Emerald) is blocking up this tube, preventing you from going any further, and as of yet, no way of shifting it has been found. What lies behind it? Nothing, because the level has not been completed beyond this point, but the exact reason for its existence has been under constant dispute. Most likely a breakable rock that hadn't yet been made breakable at that point.
No, it's not the Master Emerald, but it is a truly classic puzzle to the Sonic community.
Wood Zone
A thick and very incomplete forest. Leaves, constructed wooden walkways and hollowed-out tree trunks.
This is a far less complete zone in Sonic 2 Beta, but there's enough here to spark some interesting theories. As the simple, and probably temporary name would imply, this lost stage is set deep within a thick forest, on wooden platforms high up in the trees. The background is nothing but a thick load of dark green leaves, and around the place are wooden log platforms with railings, tunnels cut into the tree trunks with windows, and more leaves. All there is to do in the level is walk forward, fall through the tunnel and then come out to the right. There are a few other platforms and things around, but they aren't accessible without debug mode and if you try to jump out of there, you'll fall to your death.
It's this zone that seems to spark the theory that Sonic 2 was originally intended to integrate time travel into the stages, as mentioned above. Believe it or not, this level may have been where Metropolis Zone now stands, in the past, before Robotnik came and burned the wood down to create his factory. The tunnel entrances look similar to the those of the transport tubes in Metropolis, they carry the same kind of colour scheme and at an inaccessible point at the top of the map, there are even wooden conveyor belts. Perhaps most incriminating, they both have the same music in Sonic 2 Beta, which is a slightly altered version of the final Metropolis Zone tune. As with Hidden Palace, it's unknown why and at what point in production Wood Zone was dropped, but the time travel idea does create a strong, and interesting link to the Metropolis Zone.
Notice the similarity to the entrances and exits of Metropolis' transport tubes.
Metropolis conveyor belts perhaps?
Desert Zone/Dust Hill Zone
Though the name "Dust Hill Zone" does feature in the beta, it is actually an earlier version of the Mystic Cave Zone. However, it is believed to be a possible name for this level, otherwise known as "Desert Zone". A wild west style desert the likes of which are rarely seen in the Sonic series, but unfortunately this level is not in the beta, and has never been made playable to the public. This one and only image of it has been found to most probably be a mock-up screenshot, i.e. a picture made up of the proposed sprites and artwork to create an idea of what the level will look like, before it was actually made. Hence the fact that Sonic has carelessly been slapped on there off-center.
The only known, mocked-up picture of the Desert Zone graphics.
Interestingly, the sprites for that crocodile have apparently been found nestled within the Sonic 2 beta, and more interestingly, interviews with Brenda Ross, the creator of this zone, have suggested that whatever was designed of it was to be made inter-changeable with artwork for a so-called "Winter Zone"! I don't think anything else is known about that, but because they were supposed to be linked in that way, could these Desert and Winter Zones be another case of time travel in Sonic 2? We may never know. Comments from Brenda Ross have suggested that around half of the level may actually have been put together before it was dropped.
Also notice a "Genocide City Zone" in the level select list of the beta. This level contains absolutely nothing except death for Sonic and Tails, but the name certainly sounds intriguing. A desolate, destroyed city from the future, not unlike Sonic the Hedgehog (2006)'s Crisis City? Perhaps even the "bad future" version of another stage? Another name discovered in conceptual enemy sketches for Sonic 2 is a "Rock Zone". Whether this is yet another dropped stage, or an alternate name for one of the others is unknown. Bear in mind that simple names like Wood, Desert and Winter Zones probably would have been changed to something more imaginative towards the end, had they been included in the final version. Sonic level names usually conform to a pattern of either two words, or one long one, followed by the "Zone".
Sonic fans know very little about what was originally planned for most of their games, and what material was removed along the way. Other Sonic games may well have left out even more interesting stuff, but Sonic 2 probably has the most things discovered for it thus far, so a lot of conceivable theories and questions, such as the ones I've listed, have arisen, but unfortunately may never be fully answered.
#1. Comment posted by Anonymous on Saturday, 4th April 2009, 3:31pm (BST)
The music for the some of the lost zones were used as 2 player music exept Hidden Palace which was still used in the sound test.
#2. Comment posted by True Dude on Wednesday, 24th June 2009, 12:36am (BST)
It should be noted that the Concept Art for Genocide City was released back in 2005, and it turns out that it was later reused as The Machine from Sonic Spinball.
#3. Comment posted by Jared on Wednesday, 24th June 2009, 6:37pm (BST)
Glitches in Hidden Palace Zone:

-The music from the 2-Player Mystic Cave level plays during the whole level.
-When you start to drown in the water with the drowning timer counting down, the Level Select music plays instead.
-Jumping out of the water when drowning makes the Emerald Hill music play.
-When being invincible in the water and starting to drown, jump out of the water and the Aquatic Ruin music will play. Once the invincibility runs out, the 2-Player Mystic Cave music will play again!
-Their is a Tails' 1-Up Monitor instead of Sonic's.
-The level might of had the layout of the Metropolis level, meaning when you fall, you fall forever, never falling off the screen.
-Collecting 100 rings in the level triggers the Death Egg Music to play.
-Tails is missing his braking sprite when he stops suddenly.
-The tubes don't make you spin like you spin in the Casino Night or Hill Top level.
#4. Comment posted by Luis R on Wednesday, 30th December 2009, 3:52am (GMT)
After the Emerald Tube in Hidden Palace Zone
Use debug mode in the Sonic 2 beta and go right of the Emerald tube and there is a passageway with rings and a waterway and then it cuts off. This is probably where the tube would have led, except under the tube there is just water.
#5. Comment posted by Anonymous on Tuesday, 6th July 2010, 3:24pm (BST)
If you find the passage which leads to the very top of the screen, directly below it exists the continuation of the tube, only now with rings, and submerged under water. This has led some to believe a suggested theory that one reason why the level was cancelled waas because they were having looping problems with the water in the level.
#6. Comment posted by vmk on Thursday, 3rd February 2011, 12:09am (GMT)
The name "Neo Green Hill Zone" was reused in the first of the Sonic Advance series.
#7. Comment posted by Hyper Tails on Thursday, 31st March 2011, 10:36am (BST)
On youtube there is a video of some body playing hidden palace and wood zones, and they are complete! He destroys the "master emerald" by jumping on it. I suspect that the reason yours aren't complete is because you used level select.

get up to it normally and it should be complete

Please View on You tube!!!!!
#8. Comment posted by AquaRuin on Thursday, 31st March 2011, 6:14pm (BST)
To Hyper Tails, you must have been watching a hack as Sonic 2 Long Version and Sonic 2 Delta both restore the Hidden Palace and Wood Zones. In the real beta, they are exactly like what they are described as on this page.
#9. Comment posted by hypermario13 on Saturday, 5th November 2011, 7:00pm (GMT)
Correct me if i'm wrong,but I think that wood zone has something to do with metropolis zone.Because in the video that Hyper Tails speaks of,the wood zones music is the beta version of the metropolis zones music (to describe it,the begining of the song has a lower tune than the final version).AquaRuin can tell me the truth if i'm incorrect.
#10. Comment posted by Anonymous on Monday, 9th July 2012, 10:54pm (BST)
The wood zone looks very similar to the one that appeared in sonic 2 GG, i'd have to play it again to get the name.
#11. Comment posted by Natalie on Tuesday, 10th July 2012, 12:43am (BST)
Excuse me, it was sonic triple trouble, titled Meta Junglira Zone (http://sonic.wikia.com/wiki/Meta_Junglira_Zone) this zone also contains the same circular bubble things from sonic the hedgehog cd's collion chaos.
#12. Comment posted by Stick775 on Sunday, 20th January 2013, 9:01pm (GMT)
Genocide City zone was first called the Genocide City zone but they switched it to Cyber City zone. And it became a 1 act zone. But because of the rushing, It couldn't be finished and they made the art switched to Metropolis Zone and it became Act 3.
#13. Comment posted by SonicTailsKnuckles on Wednesday, 6th February 2013, 8:49pm (GMT)
In a video I saw, Wood Zone had the Emerald Hill 2-player music, the boss was a rematch of the Aquatic Ruin boss, only with an extra bottomless pit, Dust Hill had 2-player music of Mystic Cave, and the boss was the same as Emerald Hill, only with harmful bones around the place, Hidden Palacer had its own music, the boss same as Mystic Cave, Genocide City had the Casino Night 2-player music, and the boss was the Chemical Plant boss, only with another bottomless pit added. Also, there was Death Egg, which had two acts, but is Chemical Plant in space. By the way, this may be the longest sentence ever. :P
#14. Comment posted by Alex on Tuesday, 12th February 2013, 4:48am (GMT)
I'm sorry, but the data on dust hill zone is innacurate. Acctually, it exists and i've first played it today, in a gens rom (downloaded after I found a video on youtube with the zone gameplay). I also can say that this zone is some sort of nice puzzle, a bit hard to solve in the first play.

Is there any area in this website I can use to upload the rom?
#15. Comment posted by Slate The Hedgehog on Sunday, 17th March 2013, 8:35pm (GMT)
In Hidden Palace zone, all you had to do to destroy the green gem was to Spin Dash on it for a few seconds.
After a while, it splits. If that were the Master Emerald, then either Knuckle's would have been pissed so much that he wouldn't even be in the next game (O_o) or there are many giant Chaos Emeralds everywhere.
#16. Comment posted by Anonymous on Tuesday, 25th June 2013, 10:08pm (BST)
My theory on the green emerald:
In Sonic 2 beta, in order to pass, you have to destroy the green emerald. It still might be the Master Emerald, because if you jump on it, it will break. Knuckles must've passed by and saw the shattered emerald and Sonic rolling down the pipe, and vowed revenge on him, which explains why he tapered Sonic's progress in Sonic 3 and Knuckles.
#17. Comment posted by taismo4ever on Tuesday, 27th August 2013, 4:18am (BST)
Hidden palace looks like a really awesome level. I wish it had made it to the final game.

Also, wood zone looks like jungle zone from the game gear version of sonic 1.
#18. Comment posted by bmhedgehog on Saturday, 28th December 2013, 12:41am (GMT)
it should be noted that a Remake of Sonic 2 for the iOS and Android is currently available on the market. This remake was created by the team of Stealth and thetaxman (the same people that remade Sonic CD and Sonic 1 using the Retro Engine). In this version we now have an official playable version of the Hidden Palace Zone. The only downside is that the BGM is Mystic Cave Zone 2 player version and not the Sound Test #10. So I hope that this page gets updated to include Hidden Palace Zone in the Sonic 2 Guide.
#19. Comment posted by Snake Man on Saturday, 25th January 2014, 2:29am (GMT)
Hidden Palace Zone note:
The badniks ARE named. There is Redz (dinosaur), Batbrain (bat, though the name might be something else.). and Stegway (a triceratops),
Hide Notes
The hidden level select menu allows you to start from an act of your choosing.
Level Select: Go into the options menu on the title screen, and then go down to sound test. Play the following tunes in order: 19, 65, 09 and 17 (based on 17th September 1965, which is Yuji Naka's date of birth!), then press start to go back to the title screen. After Sonic and Tails have come up, and everything else has finished, hold down the A button and press start. You should be taken to a new menu where you can start the game from any act of any zone, and you can also access the first Special Stage, and another sound test can be found at the bottom. When you've selected a level, during gameplay, you can pause the game and then use the C button to advance the action frame by frame. Hold B to create a slow motion effect. Press the A button while paused to go back to the title screen, then you can just hold A and press start to go back to the level select menu straight away. If you restart the game normally, you may have to input the whole code again in order to use it.
Debug Mode: Like in Sonic 1, this allows you to change your character into any object that appears in the level and move it around the area, placing instances of that object as you go. First, get to the level select menu, then go to the sound test at the bottom of the list. Play these tunes in order: 1, 9, 9, 2, 1, 1, 2, 4 (24th November 1992 - Sonic 2's US release date). A ring chime will indicate that you've done it correctly. Select an act, but don't forget to hold down the A button before you press start. Keep it held until the level begins, and if it worked correctly, the score in the top corner will be full of letters and numbers. Now, you can press B to turn into an object, then D-pad to move your position around the level, A button changes the object, and C places one of those objects in the position you're currently in. Press B to go back to being your character, where buttons are used as normal until you press B again. You can interact with the objects you've placed, but they only stay there for as long as you're nearby, otherwise they'll disappear.
Yes, Tails did ruin this for me by collecting some of the rings when I finished it the first time. Git.
Enable Super Sonic: To cheat your way into getting Super Sonic without going through the painstaking task of collecting emeralds, simply input the level select cheat, and go down to its sound test. Play these tunes in order: 4, 1, 2, 6. The Chaos Emerald jingle will play. Now select an act, grab 50 rings, then jump.
Enable Super Tails with Super Sonic: Yes, believe it or not, you can get a form of "Super Tails" to aid Super Sonic, when playing as Sonic and Tails. First, get into the level select, and in the sound test, put both the Super Sonic code and the Debug one afterwards, so the tunes you need to play are: 4, 1, 2, 6, 1, 9, 9, 2, 1, 1, 2, 4. Choose an act and hold down A and press start, as with debug. Now you'll be able to turn into Super Sonic, and also use the regular debug features at the same time. Turn Super (you can create the necessary 50 rings yourself, remember), then change to the item box object, and open it up. This item is automatically a teleport item, as used in the 2 player versus games, and this actually transfers Super Sonic's characteristics to Tails, and he's surrounded by the standard invincibility stars. He can now run faster, jump higher, and is invulnerable to all attacks. However, because they've swapped abilities, Super Sonic no longer has them for himself, despite keeping his appearance and depleting supply of rings, he is essentially Sonic again (though he can still jump higher than normal, it would seem). Lose all your rings, so that you can officially go back to your blue self, then churn out another 50 and turn Super again, and you'll regain your abilities.
Easy Emeralds: If you're having trouble keeping 50 rings to get into the Special Stages as you play through the game, bear in mind that the number of emeralds you've collected so far is saved when you get a game over, and then start a new game through the options menu. So you can begin your first game and obtain the first emerald, then purposefully lose all your lives to return to the title screen. Go into the options menu, highlight the player select option and press start, keeping the same character you used previously. When you next go into a Special Stage, you'll find yourself in the second one, and the first emerald has been kept for you. Keep doing this for all emeralds.
14 continues (plus a catch): Go to the options menu, and in the regular sound test this time, put in the following tunes: 1, 1, 2, 4. Go up to the character select option and press start to begin the game with 14 continues under your belt. Tune number 4 is Oil Ocean Zone, and the catch is that due to a glitch of some kind, this tune will play continuously throughout the rest of the game, instead of the regular level music and sound effects that should play. So unless you plan to play without audio, or really, really like that tune, it's probably not worth it.
Switch between "Tails" and Miles: In the European and US versions of Sonic 2, when playing as Tails, his name is listed as "Tails" in the life counter at the bottom left hand corner, and in the options menu. In the Japanese version, he's listed as Miles by default, and whichever you're using, you can change it to the other one, if you've really run out of things to do that is. On the title screen, press up, up, up, down, down, down, up, which creates a ring chime and leaves you with the options menu selected. Press start, change your character to Miles/Tails alone and press start again to begin a game with him.
Cheats for Knuckles in Sonic 2
Level Select: At the title screen, press up, up, up, down, down, down, left, right, left, right. A ring chime will tell you that you done good. Hold A and press start to access the level select menu, which is exactly the same as the regular Sonic 2 level select.
Debug Mode: Access the level select menu and get on over to the sound test on the bottom right. Use the right/left and C buttons to select and play the following sequence of numbers: 1, 9, 9, 4, 1, 0, 1, 8. 10th October 1994 being the release date of Sonic & Knuckles. You'll hear that good 'ol ring chime again when done correctly. Pick a level and hold A, then press start to begin. Usual debug controls and rules apply, as described in above.
#1. Comment posted by supersonicsmash on Wednesday, 10th February 2010, 8:52pm (GMT)
If you want to enter more codes you can enter them in the sound test. Also, you can enter all the codes at once and then press B & start. If you are using De-bug do not let up on the B button no matter what even when the level select menu and level ( you know Zone 2 act 2 Hill Top Zone or whatever). Same goes for Sonic 1. I have not used any codes for Sonic CD yet.
#2. Comment posted by Anonymous on Saturday, 26th March 2011, 1:50am (GMT)
The all chaos emerald cheat for Knuckles in Sonic 2 is 1, 6, 7, ,7, 2, 1, 6.
#3. Comment posted by Anonymous on Monday, 28th March 2011, 12:10pm (BST)
Pay no attention to the last code it is wrong. The correct code for all chaos emeralds for Knuckles in Sonic 2 is
1, 6, 7, 7, 7, 2, 1, 6.
#4. Comment posted by Anonymous on Saturday, 25th June 2011, 5:14pm (BST)
A way around that Oil Ocean music catch for the continues: if you play zone music, then the last sound (7F I think - but I don't remember) then a different zone's music, and mess around with those three, the entire game is muted--right down to the Sega sound, and a reset won't fix it, but turning off the game will.
#5. Comment posted by Anonymous on Sunday, 3rd July 2011, 7:19am (BST)
A mistake in the last section (Debug Mode) - it should read "18th October 1994 being the release date..."
#6. Comment posted by Anonymous on Friday, 17th February 2012, 6:34pm (GMT)
Does this work with the Gamecube Mega Collection Version?
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#1. Comment posted by Anonymous on Monday, 28th March 2011, 10:52am (BST)
On youtube there is a video of some body playing hidden palace and wood zones, and they are complete! He destroys the "master emerald" by jumping on it. Please View!!!!!
#2. Comment posted by Malpass on Friday, 15th April 2011, 3:41pm (BST)
It's most likely from a hack, presumably Sonic 2 Delta or Sonic 2 Long Edition.
#3. Comment posted by cinos50 on Friday, 10th June 2011, 4:12pm (BST)
Can i ask you someyhing anonymous?did you use a game genie to get to hidden palace zone?cause i did!
#4. Comment posted by mechatails45 on Friday, 10th June 2011, 4:16pm (BST)
I noticed that mystic cave zone and hidden palace zone both have the same boss!whats with that sega?!?!?!
#5. Comment posted by gabriel on Sunday, 6th January 2013, 7:57am (GMT)
You know I have a new cheat :
1. Thunder grave : first go to metro polis ( easy with level select ) go with debug mode to leftuntil you die in left and then go to checkpoint with 500 ring and then turn left you let take some sonic 3 cadgride and pause sonic two then goto sonic 3 after get a shield enter sonic two with sonic 3 debug mode then you will see lightning shield and you can double jump double jump and restart quickly enter sonic and knuckles cadgride and on level select and debug code goto oil ocean or (something had forest ) then graphic easily in front you see a thunder lighning.touch it and you able throw lighning grave

2.Boom boom car level select : goto special stage and got 100 or than 100 ring quickly enter up,up,down,down,up,up,up,up (its sonic 3 level select code) now enter sonic 3 and got 50 ring and enter bonus stage or special stage in sonic 3 then quick in the name enter sonic 2. On option you will see level select with debug code now you got boom boom car after sonic sign and you got a mini game in sonic 2 its name sonic 10 mini games select boom boom car quickly before the. Lighning animantion appeer press up 10 time you will enter beta sonic 2 level select with you can use knuckles but its pinks (hyper or super knuckles
#6. Comment posted by SonicTailsKnuckles on Wednesday, 6th February 2013, 8:52pm (GMT)
Here's a cheat for ya ... Night time play!
In the above level select, hold C and select a zone. The level should be dark and there should be shadows around your character.
#7. Comment posted by SonicTailsKnuckles on Wednesday, 6th February 2013, 8:53pm (GMT)
I meant to post that in the cheats section above, but never mind.
#8. Comment posted by Jusin on Saturday, 4th May 2013, 2:12pm (BST)
The fact that Sonic CD was once to be the actual "Sonic 2" suggests many things. It's possible these levels were intended for Sonic CD, or Sonic 2. The mix between creators of the game at the time (being employees of Sega) was rather confusing, and things may have been scrapped solely due to confusion, but who knows. So, I guess in a way, Sonic CD could be considered Sonic 2 beta, but in reality is just a game that was released a little late.
#9. Comment posted by Anonymous on Tuesday, 25th June 2013, 10:03pm (BST)
My theory on the green emerald:
In Sonic 2 beta, in order to pass, you have to destroy the green emerald. It still might be the Master Emerald, because if you jump on it, it will break. Knuckles must've passed by and saw the shattered emerald and Sonic rolling down the pipe, and vowed revenge on him, which explains why he tapered Sonic's progress in Sonic 3 and Knuckles.
#10. Comment posted by Snake Man on Saturday, 25th January 2014, 2:24am (GMT)
Hidden Palace Zone is now available on iOS. Hooray!
#11. Comment posted by Anonymous on Saturday, 13th September 2014, 4:32pm (BST)
How do you get Hidden palace, Genocide city and Wood zones on sonic 2 for sonic classic collection?
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