Okay, it starts at the top of a, lets say, 30 to 40 story tall building, we could make 10 story or 20 story versions, etc and name them "Shorter" or "medium" or "long" then "longest" for different gameplay time-wise.
It will have:
Currency system (???)
Different weapons
An elevator
Plenty of action
Revive system, if you're down you get revived. If you die, you wait until the next floor (or 2)
Sillyness inspired by elevator source.
So, at the top of the building, you're in an office. The alarm goes off saying there are intruders, and you need to evacuate immediatly. The door to the stairs doesn't work, so you take the elevator. (its one of those two door elevators, like one way in front of you one way behind)
In the elevator, you find weapons and money (how many weapons and how much DOSH changes based on how many players there are.)
You go down one floor. On the floor there are many enemies and you have to survive them, each one "wave" getting harder (or sillier, say, fighting zombie clowns using bananas). You have to get to the other side of the room and get in that elevator to survive the wave. Each wave you earn a bit of DOSH
Each floor can have a completely have a different shape, music, puzzle, whatever, each elevator you take can also do the same. Eventually, when you enter an elevator, on the other door a merchant is there and you purchase weapons.
This is just a base idea, I could go on this all day, but I'm currently at a hotel and my parents are rushing me to check out. I apolgize for grammar and wording.
EDIT: OR! OR OR OR!
Wario ware with elevatrs in blockland.
