Enter these codes during gameplay:
\RAGAMUFFIN: Invincibility
\BLOAD: Load a specific level
\VICI: Complete the current level
\FMK: Full health
\GIFT: Get all inventory items
\ARMS: Get all ammo
\OVERDRIVE: Power-up microchip
\SPUTNIK: Full map
\AMOBJECT: Show objects in the automap
\GOBBET: Gib yourself
\AIMOVE: Toggle enemy AI
\DIG: Clipping on/off
\FRAME: Display frame rate