Fireboy and Watergirl games are online platform puzzles to solve adventures in cooperation with another player. These challenges can be based on different mechanics, from laser beams to slimy pits and jammed doors. New mechanics and puzzles add excitement to each new installment of the series. Fireboy is immune to fire but vulnerable to water, while Watergirl is immune to water but vulnerable to fire. This dynamic creates a constant need for cooperation between the two characters.