It seems that the thunder wasn’t the only thing that hit the world while you were out.
You go head to head with other players and only one can come out of the game as the winner. There are no limits in battle mode, everything is allowed, we actually encourage some elbow action when it seems that you might be losing. ZombieRun has controller support so dust of the old joypads and get cracking. Then we have co-op mode where up to 4 players can tackle the enemies as one team.