Nothing fancy here. Spleef arena with dirt playing field. Water in the pit for a soft landing. Separate staging areas for two teams. Staging area contains chests with diamond shovels and an ender chest to deposit personal effects prior to play. Separate exits from pit; recovery areas with food and ender chest; staircase to bleachers. Stand at ground level to paste; the exterior walls will be 3 blocks tall. You'll need to build your own staircase to enter the arena.