cool little freeware game i found

shift is to use your current weapon; unarmed you punch; takes 2 hits to knock out an enemy; if you punch them from behind you instead strangle them and kill instantly. armed it fires your assault rifle. you also punch when you want to activate or deactivate switches, or get people to follow you/stop following you.

hold down ctrl to sidestep.

z either primes a grenade and released, throws it if you're unarmed, or reloads your rifle; careful; unlike in counterstrike; once you reload, you lose whatever bullets are in the current clip.

x switches between rifle and bare hands.

instructions are in japanese, but it's not too hard to follow.