The game is typically controlled with the keyboard. For Fireboy, the player can use the arrow keys to move left, right, up (to jump), and down. For Watergirl, the player uses the WASD keys to move in corresponding directions. Throughout the levels, they need to cooperate. For example, one character may need to step on a switch to open a door for the other. They must also be careful not to touch elements that are harmful to them (Fireboy can't touch water, and Watergirl can't touch fire).