The name implied it, but I didn't listen. I seriously spent the first several minutes lost- I'd click one I got, but only the computer would get his marked, and I was sitting there like "...Bingo! Yeah, how do you like someone yelling out a false bingo, cheater?!" Then 'BATTLE' occured to me, so essentially you're fighting for what pieces you get! If it lights up, he's trying to take it, you really need to be hitting the correct number when it comes up to get it, but I've got it several times so it can't be that hard! Just, if the little circle completes around it, he's going to get it- not you. So, get 8 Bingos on two cards before your opponent, stealing as many balls as possible. It's Bingo.. War? I can't say those two words together without questioning it.