Use ~ during gameplay to open up the console then enter the desired cheat code (one by one)

List of cheat codes tested in new Chasm: The Rift release

NOTE: using cheat codes will temporarily disable achievements, to re-enable them just restart the game without saving your game.



Levels:

Episode 1 - The CondemNATION
Level 01 - The Power Station
Level 02 - The Military Base
Level 03 - The Underground Base
Level 04 - The Pit of Sarcophagus

Episode 2 - In Search of Inception
Level 05 - Dead River
Level 06 - Underdune
Level 07 - The Tomb of Death
Level 08 - The Curse of The Pharaohs

Episode 3 - The Shadow Zone
Level 09 - The City of Dander
Level 10 - The Fortress of Desolation
Level 11 - Subterranean Horror
Level 12 - Phantom's Keep

Episode 4 - The Stronghold of Evil
Level 13 - The Weird Dimension
Level 14 - Forsaken in Time
Level 15 - Abreast With Terror
Level 16 - Beyond Reality

List of cheat codes for legacy Chasm: The Rift MS-DOS release

Same as above plus:

For levels list: chasmtherift.fandom.com
Cheat codes: gamefaqs.gamespot.com