"The number of spots will be determined by the amount of interest, how many people per game you want to play (isotropic supports up to 4-person games)."
ACTUALLY, the website allows you to play with as many as 600 people in one game, if you want. It just automatically keeps scaling the winning requirements up for you (like when you add a 5th person you need to run through 4 full card stacks instead of 3). The most I've ever done personally is an 8 person game.
Anyways, guess I'll sign up, since this game is a blast!
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thengamer.com/guru thengamer.com/xstats board8.wikia.com
You should search for The Show, the cool podcast featuring Guru Champ Black Turtle!