Kill or be killed - that is the only way to end a board game a group of teenagers find and play at a party. At first it looks like fun, but then they all get pinched in the finger and seal the rules with blood. As the first of the friends dies - his head explodes - the teenagers realise that they have to stick to the rules of the game. They have to kill other people, like the game wants them to do, or they will die.