Remember that if one of the characters die you have to restart. This one is pretty straightforward, we know that as elementals Fireboy can only go on fire and Watergirl can only go in water, but what about the green lake? Both Fireboy and Watergirl have to avoid the green lake. Tap it or either character to switch between Fireboy and Watergirl. When you are running, the other direction becomes a jump button. The arrow in the middle tells you which character you are currently controlling. The on-screen arrow buttons control which character you're playing as. How do you control Fireboy and Watergirl?
Use the arrow buttons to move Fireboy and Watergirl along each maze in the forest temple.