Segas sphered simians go portable. Following the surprise success of their original GameCube launch title and the popularity of its 2002 sequel, AiAi, MeeMee, Gon Gon, and Baby roll on to the Game Boy Advance in Super Monkey Ball Jr.

As in the GameCube releases, single-player Super Monkey Ball Jr. involves a series of action-puzzle races, in which players must guide a cute monkey encased in a clear ball to roll through winding paths and platform mazes as quickly as possible, without falling off the edges. Super Monkey Ball Jr. offers over five dozen game boards of varying difficulty.

Also like the console versions of the game, Super Monkey Ball Jr. features a number of party games, including Monkey Race, Monkey Fight, Monkey Golf, and Monkey Bowling, with support for up to four equipped players through a link cable connection.