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If you are writing your own Lua script, ensure your code addresses the common issue of NPCs not getting close enough to targets by using a raycasting check before pathfinding. Pathfinding Zombie Not Efficient - Scripting Support

Roblox uses (Hyperion). While many executors bypass it, anti-cheat can still detect abnormal walkspeed or kill aura. Punishments range from a 1-day ban (for exploiting) to a permanent account deletion. zombie rush script link