You need to be alert right at the start of Act 1, because if you fall down from this first vine lift, you'll die in the only death drop of this zone. Remember that these lifts drop from their hanging vines the second they touch the far ledge, so as soon as you see it, leap off onto it. Don't hang around. If you're new to the level and you do fall, it tends to instill a feeling of unease, as you may start to expect it to be one of those precarious, high up zones that are full of death drops. Relax though, because as I said, that's actually the only place you are able to fall off in the whole stage.

At the start of Act 2, the typical route is to just head right at this point, which then occupies the lower half of the map. But you'll notice you can also take a higher road as well, directly above this cave entrance by taking a run up from the main road on the left, and jumping up to that upper ledge. From there, you have access to the alternate, and I would say, easier route through the act, which takes place along the top and brings you all the way to the end. Unless of course you take one of the sub-routes that connect up to the regular route, which are discussed in the following two points.

If you took the top route described in the last point, you'll reach the top of this narrow rock, and will notice a platform moving up and down, which can transport you upwards. Your other option is to fall to the bottom route below, but on the way down, there is an extra life hidden in a short tunnel on the right-hand wall. In order to access it, you need to carefully walk off the ledge and then toward the wall, staying close to it so that you can fall in. Jumping down won't get you there. Afterwards, you must drop all the way to the bottom, but you can either take the low road from then on, or go left, back to Point #3 to get back to the top route.

Continuing with the top route, this boulder clearly allows way to a lower area when broken, as an alternative to your beckoning path to the right. Doing so, of course, will bring you down to the low route indefinitely, and in the area just below, you must break through another boulder to go down further. Below that, yet another boulder looks quite tempting, but I recommend you ignore this third one and continue right instead. This will allow you to cut straight through the top of the earthquake cavern that I describe in the next point, rather than having to deal with tricky rising lava at the bottom of it.

If you broke through the first and second boulders described in Point #5, but avoided the third, as I suggested, a sub-route will link up with the top left corner of this room, making your passage through it a bit less stressful. Don't go down, obviously, just leap across the platforms to the top right corner. All in all, the key is quickness, because you don't want to be left standing on a falling platform, and plus, that lava is rising pretty quick. Although it obviously hurts to touch it, it's also solid, and therefore you can stand on it, and therefore you can get crushed into ceilings and bottoms of solid rock as it rises.

Your arena this time includes two small, uneven ledges sitting between two pits of lava. There are also two smaller ledges on either far side of the arena. Facing you, Robotnik will come up through the right-hand lava pit in a machine decked up in heat-resistant protection, plus a flame-thrower on top. He'll hover just above the pit, and the flame-thrower will blast out a thin wave of fire, which turns into a small fireball that slowly makes its way across the screen. On his way back down, he'll throw a couple of larger fireballs up a little way into the air, and they'll land on and burn the two surrounding platforms, so make sure you're standing on a far one. He'll then come back up through the pit on the left-hand side this time and repeat the process, and then go back and forth from one pit to the other. This would be quite a challenging boss, if it weren't for the fact that you can hit him at any time while he's visible, thus opening up the opportunity for a very easy strategy; Simply leap over to him as soon as you see him and land a hit right on the top of the machine, and don't move. Hopefully, you should be able to repeatedly bounce off of him, landing all 8 of your hits in a few seconds, without much effort at all. The only downside is that unless you can bounce over to a ledge on your eighth hit, you'll probably fall into the lava, so make sure you have rings or a shield before going for this strategy, and then jump out of the pit immediately as soon as you lose 'em. Also be aware that if you die and have to restart, there are no rings after that last checkpoint, so you'll have to go back a little way to get some.