Paper Mario: The Thousand Year DoorEdit
In Paper Mario TTYD, you must go through 100 floors to get to the bottom. Every 10 rooms there is a one way pipe leading back to the top, a guy selling items, and a treasure chest containing a badge. You might also run into a mover, who will let you skip floors for coins. On the 100th floor you must face Bonetail, arguably the hardest boss in the game, with 200 HP. One of the treasure chests contains an item that is very useful in the game, the large sack, allowing Mario to carry more items.
See here: Pit of 100 Trials (Rogueport)
Super Paper MarioEdit
In Super Paper Mario, there are two Pits of 100 Trials. One in Flipside, and one in Flopside. Every 10 rooms (except for the boss) is a "checkpoint floor". On the checkpoint floor, there is a treasure chest with a Catch Card about a Pixl or a character, and a one way pipe leading back to the top. Occasionally, Flimm will be standing next to the door, enabling you to purchase some extra items.
The two pits are listed below, along with both of them together:
- If you switch into 3D, you will drop back down to the bottom of the room. This is useful if you are trapped by enemies, or just want a quicker way to the door.