Fireboy And Watergirl 4: Crystal Temple is a two person collaborative puzzle game where players need to control the collaboration between Fireboy and Watergirl in various environments, collect crystals, and reach the finish line.

In the game, Fire Man and Water Woman are each manipulated by two players to complete tasks by manipulating their characters. The Fire Man cannot touch water and blue crystals, while the Water Woman cannot touch fire and red crystals. If a player dies, the game will restart.

In each level, players need to use the special skills of Fire Man and Water Woman to coordinate their progress. For example, in some levels, the Fire Man needs to walk on stairs, while the Water Woman can only walk on flat surfaces; In other levels, the Fire Man needs to use his power to break through stone obstacles, while the Water Woman needs to manipulate the water flow to push objects or distort light to transmit them to different positions.

Players need to collaborate to solve various puzzles and collect all the crystals. When they successfully find all the crystals and reach the finish line, they will unlock the next level.