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ZMB-13 Fixed by Army of Sarcasm

Map 2 had way too many entities and would not load. Removed entities so it will now.

You have been kept as human test subjects in an underground biological weapon research facility. A brief power failure has allowed a dangerous mutagen, code-named ZMB-13, to escape into the environment, turning everyone in the facility into the walking dead. Amazingly, your air filtration unit remained active during the blackout, sparing you from their fate. Now you must fight through the hordes to reach the surface and whatever rescue may await.

The campaign comprises three levels:
1. Barracks
2. Labs
3. Surface (Gauntlet finale)

This version works with the other fixed version on the workshop, which is my work and fix as well.