WarioWare, Inc.: Mega Party Game$! is party game for Nintendo GameCube released in Japan on October 17, 2003 in North America on April 5, 2004 and on September 3 that year in Europe.

This title contains all the microgames contained in WarioWare, Inc.: Mega Microgame$!, and it also contains 7 competitive multiplayer games, 1 cooperative game, and a selection of single-player features (for example, the ability to play any microgame of the player's choice).