Hello how may I help you? I need some information on childhood "playground" game. Sure, what would you like to know? According to the OFFICIAL rules of the game "tag", how do you know who has won the game? Tag doesn't usually have a definite ending. Players usually just stop when they get bored. If you need to pick a winner, you could say that the person who was tagged the least wins the game. I don't think so, you must not be quoting from the official rulebook. Well, tag is a playground game as you said. There is no official association overseeing tag and writing definitive rules. I know there is an official rulebook. It was at my elementary school I went to 46 years ago, but I couldn't find it online. If you saw the official rule book of tag I think that makes you the expert. I wouldn't say expert, but I can't remember what it stated about how to know who's won. Strange I remember hide and seek ruling but not tag?? Well, you can make the winner whoever everyone playing the game agrees has won. I don't care for that idea, it's kind of dumb. I'm sorry. I don't have any official rules for tag, only information on how it is usually played. Can I help you with something else?