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Bring up the in-game cheats console by using the tilde (~) key, only after your shortcut command has been set to -DEVMODE . Then, type in i_giveitem plus the corresponding cheat listed below to earn the weapon or weapon-related cheat listed. (If you want to carry an infinite number of weapons, insert your cheat [...]

F1 - unlimited ammunition on / off
F2 - unlimited health on / off
F3 unlimited armaments on / off
F4 unlimited endurance on / off
F6 - no jam on / off
F7 - an easy kill on / off
F10 - 99999 rubles on / off
F11 - unlimited inventory on / off

With this mod you can buy all weapons, armor and artifacts at the first trader in the game. (CLEAR SKY Base in the swamps). Tested with v1.5.04 downwards.

More Time
If you need more time to complete any given stage, try the following to give yourself an extra ten minutes. During gameplay, hold down the C button and press 1, 2, 1, 2. If done correctly, ten minutes will be added to your clock.

Authentic Difficulty
To unlock Authentic Difficulty, beat the game on any other difficulty setting.
All Reconnaissance Reports
To automatically unlock all reconnaissance reports in the game, insert the following code at the in-game cheats menu: 0ZNDRBICRA.

Add $100,000 Cash.
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Prison Tycoon 4: SuperMax - Trainer

While playing, press [CTRL] + [SHIFT] + [C] to bring up the cheat entry screen. Type any of the following cheat codes for the desired effect.

Beginning Of Game, 1000 Health, 1000 Energy, 500 Unspent Skill Points, 9999 Parts, All Weapons, All Abilities, All Cybernetics.