I've been hosting a Zombie Apocalypse RP using Gamemode Zombie. I placed all the zombie spawns, did /hidezombiespawns, and then I started the minigame.
Here is how I have the zombie options set up in the minigame setup:
Zombies are Enabled
Basic
Zombies:
Always find player: check
Brick damage: no check
Can jump: check
Can crouch: check
Can ride vehicles: check
Advanced
Overrides: (I don't know what this is.. I just left it at default.)
Radius Search: -1
Chance Roll: -1
Friendly Options
Follow Players: check
Zombie Options: (I don't quite know what these are either)
Return to spawn: no check
Disable LOS checks: no check
Zombie Difficulty: Hard
Director Options:
Enable Director: check
Minimum horde: 10
Maximum horde 20
Max zombies: 99
No zombies come. I have roughly 25 zombie spawns placed around the outskirts of the map. I don't know what is causing it to not work. If anyone can help it is very much appreciated.