From the Main Menu, choose Options and then Password. Enter one of the following and ignore the wrong password error.

Effect	Password
Flame Ability	000H01SS00
Flying Ability	1CHFL11G00
Half Damage	H0LB1SH0RZ
Infinite Lives Item In Inventory	H0RZSHM0RZ
View End-Game Credits	0NDS1KW0NZ
Walk Backwards	M00NW0LK0R