Watch out for these two reverse crushers near the end of Act 1, moving up from the floor, rather than the traditional ceiling attack. They move up slowly and retract quickly this time, so you need to have good timing on your side to prevent them from pushing you up into the ceiling. For each one, try and begin your jump through the gap just before, or as they retract, to give yourself the best chance.

This is a point that might confuse some, as several routes converge here and you could wander the wrong way straight into a trap. If you took a lower route, you'll arrive at the area depicted in the first screenshot, coming up from either the gap in the bottom right of the image, or from the steps on the left. You need to grab the hanging green pulley which lifts you up through a gap in the path above, and that leaves you with a choice of which direction to go in. There are three rings on the right hand ledge, so hopefully this will lure most players to that, correct side. If you take the left path however you'll be surprised by three moving crates that can crush you very easily. Don't try and get through them, they're for players who have taken the upper route, coming from the other side of the crates. The lesson is, when in doubt, follow the rings or if in even more doubt, just head right.

This boss area is more enclosed than normal, with green rocks above, and there's a reason. At the start, the ground will begin rumbling and harmless debris will fall from above, in addition to harmful spikes, so just watch out for those. Eggman will appear from the rocks and he's fitted two large yellow drills on either side of his egg-mobile. The drills will turn to face you, and Eggman will slowly charge in your direction, hovering over the ground. He has no protection above though, so this is your chance to land those hits. When he reaches the edge of the screen, the drills will turn back up again, and he'll move up (go for the bottom of the egg-mobile at this point) and return to dig into the ground, which will cause more debris and spikes to fall in random positions. During this bit, it's best to just stay in one position and focus your attention on the area just above your character and dodge any spikes that may be falling towards you, as opposed to running around, panic-stricken. He'll come back down the right-hand side and repeat the process, so again, hit him while he's charging at you. This isn't a very hard boss, but should you die, you'll return to the last checkpoint without being able to grab any rings whatsoever for the second go. So don't suck too much.