Waku Waku Puyo Dungeon is a roguelike dungeon crawler released by Compile in 1998 for the Sega Saturn and later rereleased in 1999 for the Playstation 1. Despite it sharing the Puyopuyo name, it is closer in gameplay and tone to the Madou Monogatari series.
There are three playable characters, Arle Nadja, Rulue, and Schezo Wegey. The final boss is a new character, "Doppelganger Schezo." As the name implies, he is a copy of Schezo accidentally created from his magic.