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Making a
Black Mesa zombie survival map in Hammer is quite easy. To make waves, utilize the logic_relay and the npc_maker, you will also (most likely) need multiple math_counters.
Tip:The npc_maker should primarily be used when wanting to make multiple waves of increasing difficulty. One example is having zombie scientists as the first wave, then zombie guards as the second, etc.. Otherwise, use individual NPCs and respawn them using the math_counter and logic_relay.