Timesplitters Future Perfect Hints

In the Mansion of Madness level aim for the zombies heads, this will allow you to take them out without using much ammo. In what lies below save your rounds with your revolver for Princess (the creature). You will have to shoot a barrel in its mouth and this gun is one of the more accurite guns you recive in the level. Heres a hint don't try to shoot the creature this will cause it no damage what so ever.