Original: Paper Mario: The Thousand-Year Door, released in Japan as Paper Mario 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 fourth game in the Mario RPG series and the second in the Paper Mario series.
Simplified: Paper Mario: The Thousand-Year Door (or, as it is nicknamed, Paper Mario 2) is a Nintendo GameCube RPG (role-playing game) game developed by Nintendo.