IGF 2012 grand prize finalist Johann Sebastian Joust now supports up to 18 players, following a successful demonstration at the Nordic Game Jam last week.

Johann Sebastian Joust is a screenless, audio-only multiplayer game in which PlayStation Move-equipped players attempt to physically jostle their opponents. As gameplay continues, the controllers become more sensitive to motion -- a player loses when the controller is pushed past its allowable movement threshold.

The game seen above featured three teams of six players each. The twist: one player on each team was a secret traitor. As you might expect, it ended spectacularly.

Nordic Game Jam additionally saw the debut of "Awkward Tarzan Grinding Game" a playable prototype from JS Joust's developers that employs a ridiculous setup involving multiple PlayStation Move controllers suspended from the ceiling.

[via @brandonnn]