Platypus

Free Wide Shot, Autofire, Sonic Pulse, and Rockets:
During the game, press the following buttons on your keyboard.

Code Effect

* Alt+4 * Free Autofire

* Alt+3 * Free Rockets

* Alt+2 * Free Sonic Pulse

* Alt+1 * Free Wide Shot

Invincibility:
Press and Hold Alt+F12 keys to become invincible. Remember you have to press and hold both keys all the time during the game