The gap is actually an invisible bridge . You need to walk off the edge onto thin air. The fog effects in Zombie Shooter 2 obscure this, but if you look closely (again, high-quality rendering helps here), you can see faint shimmering particles in a straight line.
Considered the hardest secret to find without a guide. The level is a massive vertical shaft filled with green acid and floating platforms. Halfway down, there is a gap that looks like a death pit. zombie shooter 2 secret locations high quality
This is the first truly high-quality secret location that separates casual players from veterans. The Asylum level is dark, claustrophobic, and filled with screaming specters. After you clear the main courtyard and enter the East Wing, you’ll find a broken chapel. The gap is actually an invisible bridge