Type in these while playing the game.

GH44= Invincible
DDB4= Time Limit Off
DD6D= Episode 1
DF6D= Episode 2
D46D= Episode 3
D76D= Episode 4
D06D= Episode 5
D96D= Episode 6
D16D= Episode 7
D66D= Into the Canyon 1
DC6D= Episode 8
DA6D= Into the Canyon 2
D26D= Episode 9
D36D= Into the Canyon 3
DE6D= Episode 10
FD6D= Episode 11
FF6D= Episode 12
F46D= Episode 13
F56D= Episode 14
F66D= Episode 15
G00D= Episode 16 (none of the cheat codes work in this episode).
F00D= Ending Sequence
SLS, BBPAN, SHARK= Bubsy slides, flys, or jumps in weird, uncontrollable ways.