Mickey's Wild Adventure Cheats for PlayStation
Unlock Level 1 - Secret Area:
If you want to skip the Boss battle and collect the items all you have to do is when you are at the point in the first level before you meet the boss fall with the last box and then jump to the right.
Unlock Secret Area - Mad Doctor Level:
At the elevator section in the Mad Doctor level step off of the elevator when it allows you to and then step back on and you will be taken to the secret area.
Unlock Stars - Mad Doctor Level:
When you get to the end of one of the passages just before the level where you ride on a plank with wheels you will see a tunnel you can jump on to. Jump onto it and then press Up + Jump and if Mickey will grab some stars and if you are lucky a Bonus life.
This chapter can only be accessed when you beat the first five worlds on hard mode. It is hard to unlock but since this is a fairly easy game you should not have too much trouble.