Cave Story/Labyrinth

Labyrinth Jumping
You wake up in another cave. There will be some blue robots nearby who you can talk to, but they don't have anything interesting to say, so shoot out the breakable block and save. Once again, this part is going to be difficult if you don't have the level three machine gun, but the spur is worth it. Equip your newly acquired blade; it can kill the purple critters in one shot. In fact, it can kill almost anything in the labyrinth in one shot. You will be relying on it a lot, so don't neglect it (note, though, that when it goes from level 1 to level 2 it decreases in range. However, it becomes more powerful and gets plowing abilities, so that's good). Anyway, jump up the platforms, and try to kill the critters before you aggravate them, because dodging their projectile attacks while not falling is a major pain. About halfway up, there will be an area on the left with 3 critters. One of them is standing in front of a life capsule, so take them out and get the capsule. Near the top, you will run out of blocks, but then a big block detaches itself from the wall and moves towards you. Jump on it to trigger another. Jump to the very top on these blocks to find a terminal, which opens the door. Jump down (don't worry about fall damage) and see that the blue robots (except the one which looks dead or out of fuel or whatever you'd call it) have gone through the door. Follow their lead, but don't forget to save first.

Reunions
You emerge from the doorway to see the scrapped remains of one of the blue robots... don't follow his lead. there will also be cockroach monsters, but they're pretty easy to avoid and die in one shot from the blade. watch out for the flying ones though, they have projectile attacks. you will find a save room soon enough with a bunch of non-aggressive cockroach monsters (you can talk to them and all that). talk to the one behind the counter and he'll give you the turbocharger if you have the machine gun, which is virtually mandatory, being that the machine gun recharges so slowly normally. If you don't have the machine gun, he'll offer to combine your polar star and fireball for the Snake. The fact that this gun goes through walls is very useful in the labyrinth, but if you want the spur, don't do it. Keep going until you get to the next save room, and there will be a (kind of weird looking) Physician and nurse, as well as Curley, looking somewhat distraught, on one of the beds. talk to the physician to restore your health and get a key, and to Curley for more information about the Labyrinth, then head up to the door with a red cross above it. be prepared, you're going to get into a boss fight in a moment. open the chest for the cure-all, and Pooh Black will appear. this is one of the biggest plot holes in the entire game. why is it called pooh black? is it really a ghost? why does it look like Balrog? whatever. Anyway, after he's done, go back to the physician and give him the cure-all for Curley. Note that there is a high up passage that will lead you to a secret door, which will give you the arms guard, a very useful item if you don't want to hold out for the spur, and useful anyway if you are. note though, if you don't have the lvl 3 machine gun, you can't get it yet. you can only get it once you have one of the two boosters, which means if you want to hold out for the 2.0, you'll have to come back for this item, but if you get the 0.8, come back for it before you fight the core. next up, another boss fight! Monster X is an annoying one, but it's doable. the blade and missile launcher work best here. After he's done, go through the door and you'll hear the sound of a teleportation. and booster will fall down the nearby ravine. If you follow him and talk to him (and you have no choice but to talk to him if you fall unless you have the level 3 machine gun) He will give you the booster 0.8, then die. if you don't want that to happen, and I hope you don't, save, and make the tricky jump over the ravine. reset if you miss (if he dies now, he won't give you the booster 2.0 later, so it's worth it to not let him die). obviously, this is much easier with the level 3 machine gun (but the spur is worth it!) in the next room, you will see Curley in front of a giant boulder, which is blocking the exit. to advance, talk to her, and then attempt to move the boulder with her.