As explained in the premise, all of the actions takes place underwater. The singleplayer portion consists of 15 missions, including cut-scenes, for one or two players in a co-op mode. As a fast-paced shooter, players command small vessels engaging different enemies. Each race has different ships, upgrades and power-ups, some of which need to be unlocked by acquiring points, through killing enemies or accomplishing team goals.
Up to sixteen players can play in the versus mode, either online or through system link.