If the game freezes, just click inside it (games can get unresponsive if you click elsewhere on the page).
Fireboy and Watergirl in Forest Temple, episode 1. How well do your hands work together? The Forest Temple is an addictive platform puzzle game, where you have to control two characters synchronously. Control both creatures at the same time and activate buttons to move platforms, push boxes and collect diamonds to get to the exit door of the forest temple.
Water girl: WAD
Fire boy: ARROWS