Proto:Mickey's Wild Adventure
This page details one or more prototype versions of Mickey's Wild Adventure.
A demo of Mickey's Wild Adventure can be found on PlayStation Magazine Disc 2. The only playable level is The Lonesome Ghosts.
Several graphics indicate the game was originally going to be named Mickey Mania, consistent with the other versions of the game.
Curiously, Psygnosis' name is spelled correctly on the early copyright screen but not on the final one.