Pit of 100 Trials

The ultimate optional challenge in Paper Mario: The Thousand-Year Door is the Pit of 100 Trials. The name says it all-- it's a 100-floor dungeon that looks as if it was built for torture. It is found near the entrance to the Palace of Shadow. According to Grifty, the Shadow Queen created this dungeon and filled it with powerful monsters. To complete this area, you must trek through 100 floors, defeat a lot of extremely powerful enemies lurking in the pits and even retrieve some new badges and the Strange Sack along the way. The enemy located on 100th floor is the boss, Bonetail. You can't save throughout the entire Pit.