In The Aquabats! Super Showdown! card game, two to four players are villains competing to capture all five members of The Aquabats, the world's greatest superhero rock band. The game consists of three types of cards: Monster cards, Action cards, and Aquabats cards. Monster cards have colors and power levels. Each turn, a player plays a Monster card and draws a new Monster card. If the card played is of the same color and a higher power level than the card previously played, that player may draw both a Monster card and an Action card. At the start of a player's turn, a Battle card or Epic Battle card may be played, challenging one player or all players respectively to a showdown. Each player in the battle must play a Monster card, and the winner may take an Aquabat card from the table or, if none remain, steal one from the defeated player. Shrink Ray cards enable a challenged player to diminish the power of an aggressor; X-Ray cards allow one to peak at another player's hand; Antibats cards foil the winner of a battle from taking a loser's Aquabat card; and Steal cards can be used to acquire another player's Aquabat card without a battle. Play continues until one player acquires all five Aquabat cards or until War is mutually declared, in which case the winner of a single round Epic Battle is declared the game's victor.