Cheats:
 Type them in whenever you need them.

 Full version :

 SATAN         - God mode
 NRA           - All weapons
 INDIANA       - Get 25 of artifacts
 LOCKSMITH     - All keys
 CASPER        - No clipping (walk through walls)
 WHERE         - X and Y coordinates
 DELIVERANCE   - Turn yourself into a pig!
 SHERLOCK      - Get all puzzle pieces
 CLUBMED       - Full health
 VISITxy       - Go to Level xy (00-99)
 MAPSCO        - Full map
 SHADOWCASTERx - Change class (0,1,2)
 BUTCHER       - Destroys all enemies
 INIT          - Restarts Level
 PUKExy        - Play script xy (00-99)
 NOISE         - Sound debug on/off
 TICKER        - Ticker on/off
 ~xy           - Plays CD-Track xy

 Demo:

 BGOKEY        - God mode
 CRHINEHART    - All weapons
 BRAFFEL       - Get 25 of artifacts
 MRAYMONDJUDY  - All keys
 SGURNO        - 100% health
 RJOHNSON      - No clipping (walk through walls)
 JSUMWALT      - X and Y coordinates
 EBIESSMAN     - Turn yourself into a pig!
 REVEAL        - While in mapmode toggles full map, full map with
                 enemies/items, and normal map

 Beta version of the full game:

 MARTEK        - God mode
 CONAN         - All weapons
 GREEDY        - Get 25 of artifacts
 JANITOR       - All keys
 MCCOY         - 100% health
 ANGEL         - No clipping (walk through walls)
 WHERE         - X and Y coordinates
 DELIVERANCE   - Turn yourself into a pig!
 REVEAL        - While in mapmode toggles full map, full map with
                 enemies/items, and normal map
 GATE          - Level warp
 ZELIG         - Change class type
 PUZZLE        - Get all puzzle pieces
 CARNAGE       - Kill all creatures