on steam or normal
They key is a regular Blockland key. It's possible for you to register it to a Steam account if you like(you can still use it as a regular key after that too).
Do secrets get bonus points?
No. Don't really want secrets.
that a short enough list for you?
I don't care how short the list is. It could just be default bricks.
I only care about brick mods.
EDIT EDIT: What's a Black Ops zombie map like?
Around 7+ rooms or areas. You can typically circle around the map. Hallways, alleys, buildings, etc. for zombies to come out of.
YES.
EDIT EDIT EDIT: And how do I make Slayer zombies able to do melee damage?
You don't need to bother about that.
I'll be handling zombies, mystery box, perks, etc. I'm making a custom gamemode for it.
Try to make it so there's very few places with only one spot for zombies to get in by.