Contract Jack [cheats] To enter the cheat codes below you need to be in Talk mode. Normal key to get there is T. Once there just type any of the following:

ammo = Gives full ammo
god = Gives god mode
guns = Gives all guns

Enjoy this fun game :)

Credits goes to iND for the original info on the codes. Shame on them though for forgetting to tell us where to use them ;)

/Hel
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Access All Chapters
To open all chapters of the game, run REGEDIT and find the key: 
[HKEY_LOCAL_MACHINESOFTWAREMonolith ProductionsContract Jack1.0] 

Change the value of "EndGame" to 1. 

Note: Always make a backup before editing the registry.