With shaking hands and a fast-beating heart, you prepare to add another block to the teetering tower. Will it continue to stand, or topple to the ground? A bead of sweat trickles down your forehead as you release the block, and then, the moment of truth. The tower sways for a second, then rights itself. It’s going to stay standing, at least for now. Although most of you are working as a team, one player is a Traitor trying to make the tower fall.