I'm in a map-making mood so here's another game that some people may or may not have played - Rocks. Rocks is a two-team game with two different sides. Each side has 10 items. The object of the game is to get all of the items on your side. In this game, the center line is the safe zone. As long as you pass the middle you get to keep the item. Usually this game is played with tagging, and I've never seen it done in minecraft so I'm not sure how you guys want to go about doing this. Anyway so you can't tag anyone on their own side, you can only tag people on your side. So say I was on blue and I crossed over to red. They can tag me, I can't tag them. The circle where the items are you can't get tug in. So if you have an item in your hand inside of the circle you can't get tug. If you're running back to your side with an item in hand or not, you can get tug on their side. Whoever gets all 20 items on their side first wins. Also if you get tug you need someone to save you (unless it's being killed then you just respawn) and it's a free run back when you save them. I'm not sure if this is possible in minecraft but I thought why not. I made a rocks field forever ago so: This is very uncool looking because i made it on half of a plot so. Also the chests are where you would put the opposite team's items but in actual gameplay there would probably be other posts or something to put them. I'll probably make a bigger one to try to show you
