The Forest Temple is where the Fireboy and Watergirl series began. Created by Oslo Albet, it introduced the simple rule that made the games famous: two heroes, two elements, and a temple that only opens up when they work together. The pair explore the temple in search of diamonds, and it remains one of the best two-player puzzle games on the web.
Fireboy can walk through fire but not water. Watergirl can cross water but not fire. Neither of them survives the green goo. Each of the more than 30 levels sets a new challenge with buttons, levers, boxes and moving platforms, and you will need to think about the order in which the two characters move. Collect the red diamonds with Fireboy and the blue ones with Watergirl, then bring both to their exit doors. Play alone, switching between them, or with a friend.