Bring up the console by pressing the '~' key. Then enter these cheats.

/health 999 		- full health
/wuss 			- all weapons
/superfuzz or god		- god mode
/nocollision 		- no clipping
/noclip			- no clipping
/wallflower 		- enemy won't shoot at you
/give thrallgun		- secret weapon

/spawn heligun    	- Gives chopper gun with unlimited ammo
/spawn magnum           - Gives the Magnum
/spawn shotgun          - Gives the Shotgun
/spawn assaultrifle     - Gives the Assaultrifle
/spawn rocketlauncher   - Gives the Rocketlauncher
/spawn sniperrifle      - Gives the Sniperrifle
/spawn reactiveshields  - Gives the ReactiveShield
/spawn rockets          - Gives Rockets
/spawn bluecard         - Gives Blue Identcard
/spawn orangecard       - Gives Orange Identcard 
/spawn yellowcard	- Gives Yellow Identcard
/spawn greencard        - Gives Green Identcard
/spawn keyring 		- Gives small key
/spawn moneybag 	- Gives bag from bank robbery
/spawn evidence 	- Gives papers with evidence
/spawn coin             - Gives a coin
/spawn health           - Gives a healthpack
/spawn cookies          - Gives a pack of cookies
/spawn lensflare        - Weird light-effect
/spawn silencer         - Gives a silencer for a standard gun
/spawn chemsuit         - Gives protection suit

/map intro  	Over Freeport City Bank 
/map bank	Freeport City Bank   
/map abandon	Abandoned Freeport   
/map csite	Construction Zone   
/map subway	Abandoned Subway  
/map chem1	Sintek Chemical Labs   
/map chem2	Sintek Chemical Plant   
/map whouse1	Sintek Warehouse   
/map whouse2	Sintek Warehouse Part 2   
/map biomecha	Biomech Factory 
/map biomechb	Biomech Factory Part 2   
/map silo	Missile Silo   
/map sewera	Freeport Sewers  
/map aq1	Freeport Aqueduct   
/map sewerb	Freeport Sewers Part 2   
/map dam	Freeport City Dam   
/map wworks1	Freeport Water Works Part 1   
/map wworks2	Freeport Water Works Part 2   
/map oilrig 	Sintek Oilrig  
/map geo2	Geothermal Subtration   
/map geo1	Geothermal Plant   
/map uwpass1	Underwater Passage   
/map uwpass2	Underwater Passage   
/map docks1	Hidden Docks Part 1   
/map docks2	Submarinal Cargo 5   
/map jungle	Jungle Pass   
/map jungle2	Jungle Pass Part 2   
/map gorge	Mountain Gorge   
/map area57	Area 57   
/map biomass	Biomass Reclamation Center   
/map xeno1	Xenomorphic Laboratory   
/map xeno2	Xenomorphic Laboratory Part 2   
/map mansion1	Estate Sinclair    
/map mansion2 	Estate Sinclaire Part 2  
/map phoenix	Munt Phoenix   
/map thrall	Thrall Master   
/map training	Training   
/map training1	Training    
/map training2  Training 
/map training3 	Training   
/map training4	Training    
/map paradox 	Bonus level  

Thanks to Revolution readers John Sawyer, Derek, Steve Eyles, Peter Ringberg, Tom Axworthy, King Phil, Andy, Andrew Burch, Solid Sycho, Luka íˆelan, Vince Lombardi, Razor, Killah12 and Jugnutts!