"No, no. I insist."
You are standing on a conveyor belt.
The belt is moving.
At the end of the belt is a mincer.
So are all your friends.
No barrier
Scan to play. Nothing to install, nothing to sign up for, nothing to remember. Eight seconds from stranger to screaming.
In the room
The code is the invitation. By default you have to be there to see it, which makes every game a thing that happened somewhere, with people.
Two minutes of mayhem
A round lasts about as long as it takes to explain the rules, which is why the rules are "hold it, then let go".
Nobody can outrun the belt on their own. The maths does not allow it.
Do please bear that in mind when deciding how much you like your friends.