If you grab too many of these, the effect wraps-around, and you lose your fisheye vision.  









If you grab too many of these, the effect wraps-around, and you lose your night vision.  

If you grab too many of these, the effect wraps-around, and you become vulnerable again.  ("Invincibility" does not protect you from the plasma pistol. 

If you grab too many of these, the effect wraps-around, and you become visible again.



Has the best sound effects.





In my opinion, the best all-around weapon.



Makes cool noises.

Not present on all levels--even though you always have the pistol.