Fireboy and Watergirl 4: The Crystal Temple

Game description:

Fireboy and Watergirl know no rest and are ready to hit the road again! This time they are going to the mysterious Crystal Temple that is rumored to host plenty of shiny gems they're after. Playing as the two characters, you must work together to combine their unique powers and navigate through a series of levels filled with cunning obstacles and traps. Fireboy can move through fire and collect red diamonds, while Watergirl can move through water and collect blue diamonds. As a team, they're are invincible!