The hero of the game is a young jungle-man named Toki. One day the evil wizard Dr. Stark kidnaps his girlfriend Wanda. When Toki tries to save her, he is turned into a monkey! Now Toki has to find Dr. Stark in his palace, rescue Wanda, and become a human being again!

Toki is a platform game with many various levels: jungle, underwater, volcanic caves, on the ice, etc. Toki's only weapons are spitting on the enemies or jumping on them and crashing them. There are many possibilities to upgrade his spitting "weapon"; for example, if he finds an upgrade, he can spit fireballs.