With the game running, players can join along and play on their phones (or other mobile devices) by entering room codes for that game — most of the games allow up to 6 - 8 players participating in the game, while other viewers can be part of the «audience», which can include several thousands of people. (dualshockers.com)
Once a game is started from the in - pack menu, players simply connect to the «jackbox.tv» web address on their device and then enter the on - screen room code to enter a game. (nintendo-insider.com)