Game Party Champions is the fifth game in the Game Party series and the 4th exclusive to Nintendo. It has a collection of 8 competitive games, with each one having different variations to unlock in story mode. the game are:
Up to four players can participate with three using Wii remotes and one using the Wii U gamepad. There is a party mode where the players are on a board and spin a number to move correspondingly. After a player spins they will have to play one of the games with an objective, if you lose you will have to move back to where you spun. In story mode your brother forces you to go to an arcade and play in a competition that features all of the games and there different variations.
Page nine of the instruction manual features a screenshot of the firefighting variant of the water gun game. However, the screenshot is from an earlier version of the firefighting game where there were barrels with water droplet icons on them that served as powerups. The firefighting game was changed considerably prior to release, and the powerup barrels were removed, but the old screenshot was still included in the manual.