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I am confused by this now. I see in the Weapons & Items part of halflife2.net there are a numerous amount of weapons.

I was wondering if i missed anything...
These are the weapons I used:
Crowbar
USP
.357 Magnum
Sub Machine Gun
Shotgun
The very weird sniper rifle type gun
Incendiary Rifle
HE Nade
Rocket Launcher
Alien Pheromones
The Manipulator/Super Manipulator

Thats all... I am not sure if I missed any weapons or something.