Here are some cheats and tips for the game Flashback.
Kill guards:
Enter PIXEL as a password.
Level Easy Normal Hard
1 JAGUAR BANTHA TOHOLD
2 COMBEL SHIVA PICOLO
3 ANTIC KASYYK FUGU
4 NOLAN SARLAC CAPSUL
5 ARTHUR MAENOC ZZZAP
6 SHIRYU SULUST MANIAC
7 RENDER NEPTUN NOWAY