To activate any of the cheats in Prey, Hold CTRL + ALT + ~ (the tilde key next to the #1) to display the console window during game play. Then simply enter one of the cheat codes below to activate that cheat's affect.

God Mode
Cheat code: god

Refill Health
Cheat code: givehealth

Invisibility
Cheat code: notarget

Refill Ammo
Cheat code: giveammo

Unlock Everything
Cheat code: give all

Turn on and off Ghost mode
Cheat code: noclip