Start the game with the -DEVMODE command line parameter by making a shortcut to the game on your desktop. Right click the shortcut and edit the properties putting in the -DEVMODE option and clicking 'OK' before the end. Then during gameplay press one of the following keys to activate the corresponding effect. In developer mode ALL levels will be unlocked.

Decrease Speed:
- (minus)

Increase Speed:
= (equals)

Give 999 Ammuntion:
O

Give ALL Weapons:
P

Toggle 'bgod' Mode:
Backspace

Toggle 1st and 3rd Person View:
F1

Move to Next Checkpoint:
F2

Create Spawn Point:
F3

Togle No Clip (fly through walls):
F4

Return to Default Speed:
F5

Save Curent Positon:
F9

Load Current Positon:
F10

Toggle Extra Information:
F11

Level Select
Press '~' to bring up the console and enter these codes:

Archive Level:
\\map archive

Boat Level:
\\map boat

Bunker Level:
\\map bunker

Carrier Level:
\\map carrier

Catacombs Level:
\\map catacombs

Control Level:
\\map control

Cooler Level:
\\map cooler

Dam Level:
\\map dam

Factory Level:
\\map factory

Fort Level:
\\map fort

Pier Level:
\\map pier

Rebellion Level:
\\map rebellion

Regulator Level:
\\map regulator

Research Level:
\\map research

River Level:
\\map river

Steam Level:
\\map steam

Swamp Level:
\\map swamp

Training level:
\\map training

Treehouse level:
\\map treehouse

Volcano Level:
\\map volcano

Set armor (demo version)
Use Notepad to edit "\Scripts\Default\Gamerules.lua" file. Find the line with "armor = 0;" string and change the value to 255. Save the changes and run the game. You should always backup any files you change in case you make a mistake or it mucks up your game.

Invincibility (demo version)
Use Notepad to edit "\Scripts\Default\Gamerules.lua". You should always backup any files you change in case you make a mistake or it mucks up your game. Find the following line:

ai_to_player_damage = { 1, 1, 1, 0.5, 0.5, 0.5 }

and change it to:

ai_to_player_damage = { 0, 0, 0, 0, 0, 0 }

Save the changes, and run the game.

Unlimited ammo (demo version)
Use Notepad to edit "\Scripts\Default\Entities\Weapons.lua" file. You should always backup any files you change in case you make a mistake or it mucks up your game. Find the line with "loacal unlimitedAmmo = 0;" string and change the value to 1. Save the changes and run the game.