Fleet Commander is a Galaxy sized RTS

Put 2 of them on opposite sides of a wall and charge $5. You get a PIN code to type in when you start which gives you access to a commend ship, and you can keep playing until that ship is destroyed. The kids on the other side of the wall are the enemy fleet, and a turnstile forces kids to one side or other to keep the numbers about even.

Also, I think this is how wars will be fought in the future and I am insanely jealous of those nerdy kids, who are living my 10-year old sci-fi dream. I want one of these things.