WarioWare, Inc.: Mega Party Games! is a party video game for the GameCube. A remake of WarioWare, Inc.: Mega Microgames!, and the second entry in the WarioWare series, the game translates the "microgame" gameplay of Mega Microgames! to be playable in a multiplayer environment. It comes with eight special multiplayer modes for up to four players that all involve the known microgames in some way.

Its gameplay shares elements with other WarioWare titles, emphasising quick consecutive minigames for the player to complete (dubbed by the game as "microgames"), but focuses more on multiplayer than other games in the series.