This game features the same gameplay as the original Tetris. Differently shaped blocks fall from the top of the screen and the player must arrange them in such a way that a solid horizontal line is formed. This game can be played single player (Marathon or 40 Line) or Multiplayer (4 Locally or 6 Network).
Everything about this game is like the original Tetris except the theme. The "Splash" is due to the fact that the background is a fish tank. The player can allow more fish on screen at once by completing certain achievements and can unlock new themes and fish species by purchasing DLC add-ons.