サンリオ World Smash Ball! is a competitive multiplayer sport game that uses four playable characters from Sanrio's wide catalog of cute mascots; Keroppi, Tabo, Pokopon, and Hangyodon, while Hello Kitty acts as referee for each contest. Each arena is subtly different, with multiple configurations of breakable blocks, impassable squares, walls and other obstacles that the two players can use to their advantage to win the match.