Half-Life 2: Zombie Master Retreat Map (v2)

As you know, not all the spawns can be active, or else the zm could spam zombies in later Tiers before the humans arrive.
Tier 1 - Screenshot 1, 2 & 3 -Tier 1 is where the players spawn, in a secluded outpost. -Its an open enviornment with many openings, which leaves players vulnerable. In contrast it has plenty of ammo. -The players can choose to start holding the l