Invisibility is a power-up that makes the user almost completely invisible for 30 seconds. It appears as a semi-transparent statue of Serious Sam.
Invisibility is only found in a few Serious Sam: The Second Encounter multiplayer levels and one Serious Sam 2 deathmatch level.
- Invisibility is useful in long-range levels when combined with the RAPTOR Sniper Rifle. Someone using invisibility is very difficult to see at long range, and the sniper rifle lets them kill enemies at long range with ease. Since the person is very hard to see while using invisibility, the one using it will have the upper hand in a deathmatch.