Expert can be slightly brutal, specifically if you get a tank spawn and a terribly placed witch spawn.
Also, in Versus I think it will be extremely difficult to beat expert mode.
Difficulty setting only changes 2 things:
#1 – Anything above normal spawns a witch
#2 – Zombie damage is increased.
Nothing else changes but those zombies hit HARD on expert lol…
Since it increases damage, if you are up against human players playing the zombies, they will also receive that damage buff!