In the event of an attack by the Omega Virus, the player would be given the option to, depending on the number of weapons the player possessed, press one to three buttons out of a possible four in total (0,1,2,R). If the player did not press the same buttons that the Omega Virus has attacked with, an item (access card or weapon) would be destroyed. Additionally, if two players ended up occupying the same room, they could attack each other. The procedure is much the same, except the attacking player would be asked to push one button to launch an attack. The defense is the same method as if the Omega Virus were attacking.