During the game, press:

VONLUX - full life
HUIBON - all weapons

Francis Lydiatt

In the password screen type "COMMANDO". You will get a hidden level where you are in a boxing ring fighting various enemies.

Erik Eberwein

OTOREL-Auto Reload>Automaticly reloads weapons VENRUFf-stops virus>stops virus TIXOBO>Skips stage>skips stage