Paranoia - it is a our single-player modification for Half-life. You will play the role of a russian officer of the secret service. Your first impressions are that this mission will be just like any other, but you really have no idea what nightmares future events have in store for you...
Paranoia is an excellent Mod i must say, though it crashes here and there ( you will have to find a way to circumvent the crashes by crouching or moving backwards into the next area)
If you like to be scared and wanted to be a russian Spetnaz agent than this Mod is for you