(1: all the worlds of the fighters are connected via the world of light, for example, if you want to travel from Hyrule to Dreamland first you have to go through the portal in Hyrule to the world of light then find the portal to dreamland

(2: the zombies are unaffected by rules that affect zombies that already exist in the world, for example, the zombies will be talking about, won't burn in the sun if they head to the Minecraft world

(3: the zombie virus can infect any creature, Pokémon, Pikmin, you name it

(4: any infected fighters will still have their powers and skills and still know how to use them

(5: any fighter you don't pick will become a zombie (if they can)

(5: this is only really if you want to see if you could do it's better but you're only allowed to select 6 fighters to form a team with