A pop sensor and device for revealing a winner for use in battle or sword-type games with at least two players. A device for revealing a winner comprises a bladder, a pop mechanism, a pop mechanism support structure, and a bladder destruction apparatus. The device for revealing a winner is coupled to a pop sensor system comprising a pop sensor that is worn on the player's body. Activating the pop sensor causes the player's pop mechanism to activate and cause the bladder to pop, instantly disengaging the losing player while revealing the winning player.