The game is typically controlled using the keyboard. For Fireboy, the common controls are the arrow keys to move left, right, up (jump), and down. For Watergirl, the controls are usually the WASD keys for movement. The goal is to coordinate the movements of both characters to overcome obstacles, such as using Fireboy to activate fire - based switches and Watergirl to activate water - based switches. They also need to collect all the diamonds in each level to unlock the exit.