When there, shoot a rocket at the piece of the wall that is right next to the temple. Right before going through the doors into the large arena, go left and follow the wall until you reach its end. The Ghostbuster can be found in Serious Sam Classics: Revolution's version of Alley of the Sphinxes. Unlike the minigun, the Ghostbuster's beam has a fairly limited maximum range, making it impossible to take out enemies at long range.

However, it eats up ammo much faster than the minigun does. The beam fired by the Ghostbuster deals a significant amount of damage to enemies and can kill enemies faster than the XM214-A Minigun can. Using the same power cells as the XL2 Lasergun, this weapon was originally designed to be a replacement to the XM214-A Minigun however, as it never entered mass production, most soldiers believed this 'super weapon' was just the stuff of legends. The XL4 was used by a select few highly trained Earth Defense Force soldiers for secret field testing, where the weapon quickly got the nickname 'Ghostbuster', due to its similar nature to a weapon from a certain movie. An even more experimental branch of the original XL2 Lasergun research, this weapon fires a deadly continuous beam that cuts through everything.

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