Paper Mario Black Pit (Nintendo 64 N64) The Thousand Year Door

While busy searching for Goomnuts, Mario ends up falling into a hole he saw too late, stumbling into a cavern occupied by a hermit named Cheato along with several other quirky characters. The only presumable way out is through the Pit of 100 Trials, a dungeon filled with enemies and other traps to impede Mario and friends.

Paper Mario: Black Pit is a Game Mod of Paper Mario 64 prominently featuring TTYD's Pit of 100 trials as its focus, but with multiple Roguelike elements. Created by elDexter.