Paper Mario: The Thousand-Year Door, released in Japan as Paper Mario RPG (ペーパーマリオRPG), is a role-playing game developed by Intelligent Systems and published by Nintendo for Nintendo GameCube. The second game in the Paper 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, although Bowser 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.