The main rule is set up in the game is â€œBig fish eat little fish!â€. You can activate the player number by clicking on up sides in â€œPlayerâ€ select screen and you can pick your own fish character.
Player 1: â€œW,A,S,Dâ€
Player 2: â€œARROW KEYSâ€
Player 3: â€œMOUSEâ€
Also game supported touch controls.