Hey guys, first post.
I've been playing AR for a couple of years now. One of the things a guy at the office and I do, is create a map that essentially flat, as wide as you can make it. The idea is that one end is yours to defend, the other is someone else's. The way victory is established, is by knocking over a 'peg' ( a single metal plate, linked at the bottom and held upright by an untensioned rope at each side /|\ Knocking over the other persons peg result in success.
Maps are usually set up offense/defense, that is the person that aset's up the map may place a small bunker around their peg, and have a train (or just missles) flying towards the defensive peg. You then have a limited amount of money with wich to defend your peg, and if you're able to knock down the opponent's peg (via luck or skill) you get to set up the next map.
We've also had similar competitions involving building a tower to a set height, and having it withstand a static weight (or bomb) dropped on it.