Hidden message
Type "X" at the title screen.

Move through mushrooms
Press [Caps Lock] during game and type "djarum".

Invincibility
Press [Caps Lock] during game and type "nala".

Eight lives
Press [Caps Lock] during game and type "hector".

Skip level
Press [Caps Lock] during game and type "morrison".

Curve gun
Press [Caps Lock] during game and type "nice box".

Destroy surrounding mushrooms
Press [Caps Lock] during game and type "nuke em".

50,000 additional points
Press [Caps Lock] during game and type "pernts".

Enable high scores while cheats are activated
Press [Caps Lock] during game and type "scumdog".
S
Padlock
Press [Caps Lock] during game and type "snapple".

Machine gun
Press [Caps Lock] during game and type "squish".

5,000 additional bonus points
Press [Caps Lock] during game and type "usmc".