The Forest Temple

In this action-puzzle game, the first in the Fireboy and Watergirl series, the protagonists explore the Forest Temple in search of diamonds. There are 32 single-screen levels in which players have to activate buttons, move platforms and jump over lava and water pits to reach the exit. Fireboy can safely walk on lava and collects red gems, while Watergirl is safe in the water wells and collects blue gems. The green goo hurts them both. The game was designed for two-player co-op using a single keyboard (on PC), but it is possible to play alone by switching between the characters to solve the puzzles in each level.