Fireboy and Watergirl 4: Crystal is a challenging puzzle game. You can either play alone or with a family or friend, which would be more enjoyable of course. You can opt to be the Fireboy or the Watergirl. Do not let Fireboy reach the water lakes because he will be dead. The same with Watergirl, do not let her reach the fire lakes because she will die too. Take note, fire and water cannot be mixed together. Green lakes are dangerous to both of them so jump as high as you can.
Collect all the diamonds along your way. Fireboy must collect red diamonds and Watergirl must collect green diamonds. You will be ranked in each level depending on how much time you have consumed before reaching the exit doors. To control Watergirl, use the Letters A, W and D keys to move Watergirl while to control Fireboy, use the arrow keys.