Power Primate Practice (found Jetix Flash game; 2005)
Power Primate Practice is a lost flash game based on the Jetix TV show: Super Robot Monkey Team Hyperforce Go!
In the game you control Chiro and the monkeys in maze like stages, you can change characters by standing on character specific plates, each color represents of the monkey by color (Yellow, Red, Green, Blue and black) The goal of each stage is to get to the exit without getting hit by the skeleton monsters walking around and other various hazards. by changing characters you can unlock color specific doors.
The game used to be available on various JETIX websites, however since JETIX is now defunct, all the sites directing to them are now automatically redirected to various Disney webiste.
The only Proof of it's existence is a very low quality screenshot and a fan made wallpaper using sprites from the game.
References
[1] (original upload of the wallpaper)