The game centers on "over-the-top" baseball featuring items and character-specific abilities.

in North America) is the 2008 Wii sequel to the GameCube hit Mario Superstar Baseball

It is a baseball game developed by Namco Bandai that features Nintendo characters, including the Mario cast, playing alongside classic Famista original characters.

While the main cast (Mario, Luigi, Peach, Bowser) is present, the Japanese version features a few Diddy Kong Racing cameos and unique enemy team members (like the Spooky Speedster ghosts) that were cut from the international release due to licensing quirks.