Prey

Cheatmode:
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Submitted by: Haspa
Hold [Ctrl] + [Alt] + ~ during game play to display the console window:

Result                 Code
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God mode             - god
Health               - givehealth
Ammunition           - giveammo
Get everything       - give all
No target by enemies - notarget
 

Prey [demo]:
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Submitted by: Jan Egbert Brouwer

Type Ctrl-Alt-~ to get the console.
Type god for immortal,
Type give all for everything

These cheats only work in the demo.