here is the cheats for F.E.A.R. (a good game). :)

Code:
When?playing?the?game?press?the?[T]?key?(talk)?and?then?type?any?of?the?cheats
below?(case?sensitive)?and?press?[Enter].

guns????????All?weapons
armor???????Full?armor
health??????Get?full?health
ammo????????Get?loads?of?ammo
god?????????God?mode
notarget????Invisibility
pos?????????Position?mode
tears???????All?weapons?and?infinite?ammo
build???????Display?build?version
poltergeist?Ghost?mode
gear????????Increased?health?and?boosted?reflexes
maphole?????Skip?to?next?level
kfa?????????Weapons,?full?ammo,?armor?and?health

Weapon?cheats:

gimmegun?assault????????????rifle?get?assault?rifle
gimmegun?cannon?????????????cannon
gimmegun?dual?pistols???????dual?pistols
gimmegun?frag?grenade???????frag?grenade
gimmegun?missile?launcher???missile?launcher
gimmegun?nail?gun???????????nailgun
gimmegun?remote?charge??????pipe?bomb
gimmegun?pistol?????????????pistol
gimmegun?plasma?weapon??????plasma?railgun
gimmegun?semi-auto?rifle????semi-auto?rifle
gimmegun?shotgun????????????shotgun
gimmegun?submachinegun??????SMG
gimmegun?proximity??????????trip?mine

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For?the?demoversion:

Press?[T]?during?the?game?and?type?in

god

Now?you?are?in?...?guess?what?...?right,?in?god?mode.