War Grounds is a local party game for lots of players on one keyboard. Everyone controls a coloured pen inside a closed arena, and every pen leaves a trail behind it.
Your pen moves forward on its own, and you can only turn it left or right. Trails stay on the arena, so the space keeps shrinking. If you touch another player's trail, you are out instantly, and the same happens if you touch your own trail. Use your trail to cut off the other players and trap them. The last player still alive wins.