This is 1v1v1v1 restone arena with one person who controls the arena. To set up correctly, set every players gamemode to adventure (/gamemode 2) except for the arena controller (who should be in creative). Then set time to night (/time set night) and everyone go to bed to set spawn. To open doors to release players is the lever on the floor. The rest of the buttons and levers are labeled. There is also a beacon signal you can activate to do what ever else you wish to signal. There are four hopper trails to each player so dispense each player his/her item they won in the match. As soon as each player is out I recommend closing the door so they cant get out if they die and re spawn. I would also recommend doing ,/gamerule keepInventory true, to keep peoples items when they die so it wont get unfair right away. This arena works with realms due to the non need of command blocks. I'll make a new version holding eight players, 4 controllers, and possibly command blocks. Hope you guys enjoy brawling it out in this awesome arena of redtone.