The premise: A zombie addon that would realistically model zombie outbreaks and/or be used in gamemodes for added realism.
How it should be done: Any zombie and/or headcrab can infect a humanoid NPC.
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When a zombie kills an NPC, its ragdoll is left lying on the floor for an X amount of time (controlled by a slider). This represents its “sleep time”. The ragdoll should be tinted a color to confirm that it is an infected NPC, awaiting to be awaken.
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After its “sleep time” the ragdoll gets cleaned up, and a zombie comes out of the ground in its place. The zombie should be the type that infected it. A fast zombie should give birth to a fast zombie etc.
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The zombies should have sliders for their health (if you want to make strong/weak zombies).
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The plague should be toggle-able.
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There should be a reset button that sets all zombies on fire and destroys them all.