by aerhon
here is 2 possibility1 / turn number
from round 1 to 5 revealed Zombie are at level blue
from round 6 to 10 Zombie are at level yelow
from round 10 to 15 Zombie are at level orange
and up to 15 they are level red
so we just have to keep track of the number of turn ( with the tiny yellow token for exemple ! )
i will try to play test it to have an idea at what turn number the up should be made ;)
2 / always one less than the hero level so if survor are in orange Zombie Spawn is yellow this will also prevent to get to red level wich would certainly be quite difficult considering the night scenario extra diffuculty !
what do you thing ?