No One Lives Forever 2 (demo) Cheats & Codes for PC 

The Operative: No One Lives Forever (sometimes abbreviated as NOLF) is a first-person shooter video game with stealth gameplay elements, developed by Monolith Productions and published by Fox Interactive, released for Microsoft Windows in 2000. The game was ported later to the PlayStation 2 and Mac OS X.
Cheat codes, console commands, secrets:
To use the following codes, you must first press "T"
and then type in the code:

god - Invincibility On/Off
skillz - Skill Points (Only in Levels 3 & 4)
build - Display Version On/Off
maphole - End Level Successfully
pos - Display Position On/Off
poltergeist - Invisibility On/Off
health - Full Health
armor - Full Armor
baddaboom - Explosion
Cheat codes, console commands, secrets and system requirements for No One Lives Forever 2 (demo) free online.

Game description

Microsoft Windows, PlayStation 2, Mac OS X
Game Developer:
Monolith Productions
Game Genre:
First-person shooter, stealth
Game Mode:
Single-player, multiplayer (Windows, Mac)
Game Publisher:
Microsoft Windows Fox Interactive Mac OS X