CheatCodes.com has all the official Postal III PC cheats to unlock everything. If you know of any that we don't have, please let us know.
All published and official codes as of Wednesday May 22, 2013 for Postal III are shown below.
Enter cheat mode and enter: host_timescale 0.1
To enable cheat mode, first create a shortcut for postal iii to your desktop. It's in the directory you installed Postal 3 at. For example, for Steam it would be at: ../Steamapps/common/postal iii/. Next, right click and press properties. At the end of the shortcut location add -console. It should now look something like this "C:\Program Files (x86)\Steam\SteamApps\common\postal iii\p3.exe" -console. Another way to do it is if you got steam you can find it in your library, right click, properties, set launch options and then add the -console here. To use the cheats below simply open up the console by pressing the ` (tilde key) and enter sv_cheats 1. That will enable cheat mode. Once you're there, you can enter the other cheats.
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