I was sitting on my computer eating pizza when I though of an idea to make a Mob Arena! I dropped my pizza and went straight to creative to build like a arena on my plot (diagram when I finish it I we'll place a pic of it on this thread) and if you don't know how to play it here's how: there will be different kits and u must select one, then you will spawn off in the arena you must defeat the mobs each round to get tot he highest round, and if they kill you your out.
And maybe, to make Mob-Arena more creative; we could have random power-ups placed on the floor which can have potion effects. And random chests with swords, armor, invisibility and more! Or if at certain levels, something crazy happens like everyone gets dizziness, and a giant wave of zombies come... That'd be cool!
Yeah, like say you and me are playing and we get to level 10 and we have to fight the boss like (ender dragon) something like that and it will keep going every 10 levels you reach.