Paper Mario: The Thousand-Year Door, or Paper Mario 2, released in Japan as Paper Mario RPG (ペーパーマリオRPG?), is a console role-playing game developed by Intelligent Systems and published by Nintendo for the Nintendo GameCube. The Thousand-Year Door is the second game in thePaper Mario series.
The Thousand-Year Door borrows many gameplay elements from its predecessor, the Nintendo 64 game Paper Mario. These elements include a turn-based battle system with an emphasis on action as well as a paper-themed universe. For the majority of the game the player controls Mario, althoughBowser and Princess Peach are playable at certain points. The plot follows Mario's quest as he tries to retrieve the seven Crystal Stars and rescue Peach from the X-Nauts.
The game was well received by critics, with an average score of 88 percent from Game Rankings. In general, critics praised the game's engaging plot and gameplay, but criticised it for not being a big progression from its predecessor. The Thousand-Year Door won the "Role Playing Game of the Year" award at the 2005 Interactive Achievement Awards.