Part 3 - Cave
The second ledge is north of the ledge. "You are on a different ledge, still surrounded by pits. From here you can see that there's a cave to the east. The first ledge is in the distance to the south." Instead of going south when the player is in the second ledge, fall. Instead of going west when the player is in the second ledge, fall. Instead of going north when the player is in the second ledge, fall.
Instead of jumping south when the player is in the second ledge and the player is wearing the boots:
say "You jump back.";
now the player is in the ledge.
A zubat is a kind of thing. "A wild ZUBAT appears." Understand "bat" as zubat. A zubat is usually fixed in place. Instead of attacking a zubat, say "Sorry, you are out of useable Pokémon." Instead of burning a zubat, say "Sorry, only a Pokémon can attack another Pokémon."
The long cave of longiness is east of the second ledge. "You are in a cave. Inexplicably, it's still light enough to see here. Some ambient music with a very simple melody begins playing. There is a passage to the north, and the entrance is back to the west." In the long cave of longiness is a zubat.
The long cave of longiness part 2 is north of the long cave of longiness. "You are still in a cave. It's still light enough to see. There are passages to the east and south." In the long cave of longiness part 2 is a zubat.
Before going east when the player is in the long cave of longiness part 2 the first time:
say "You continue to go through the long, twisting maze. As you run past zubat after zubat, you realize that this was supposed to be platforming game, and wonder why there's an RPG reference here."
The long cave of longiness part 3 is east of the long cave of longiness part 2. "You are still in the cave, but the end is in sight! The exit of the cave is to the east. To the west is a teleporter back to the second room." A lampshade is in the long cave of longiness part 3. The description of the lampshade is "It has a tag on it saying 'Made by Tropes Inc.'"
The cave exit is east of the long cave of longiness part 3. "You are outside of the cave. The cheerful music starts playing again. The cave entrance is to the west. To the east, the ground bends up into a roller-coaster-like loop-de-loop. To the south is a house with steps leading up to it."
After examining the cave exit the first time, say "You see something blue zip by and go through the loop-de-loop."
Before going east when the player is in the cave exit the first time, say "You try to climb the slope, but you just fall back down. I guess you can't run at the speed of sound. Not like Sonic. Or Tails. Or Knuckles. Or... wait, can everyone run fast enough to get through these? You duck and start spinning, and find yourself rolling through the loop no problem."