This was supposed to be the GameCube's equivalent of Super Mario 64, but obviously things didn't pan out that way. Despite mixed reception, the game became commercially successful, found a devoted fanbase, and apparently warrants a sequel on 3DS (which isn't out yet as of this writing).
Paper Mario: The Thousand-Year Door (Nintendo), GameCube; role-playing video game developed by Intelligent Systems & published by Nintendo, it is the 2nd game in the Paper Mario series. The player controls Mario, although Bowser & Princess Peach are playable at certain points. Plot follows Mario's quest as he tries to retrieve the 7 Crystal Stars & rescue Peach from the X-Nauts. Won RPG of the Year award at the 2005 Interactive Achievement Awards.