It'd consist of a lot with a MASSIVE system of caves, all rigged with traps, tricks, etc. Four players would be spawned in the middle of the cavern, and they have to escape this cave. Besides the different traps that await them, they have an even DEADLIER foe: The Slenderman. He would be a SINGLE enderman mob, yet he would be near invincible, and as powerful as an ender dragon. He would be hunting the players throughout their trek out of the cavern, trying to destroy them when it'd hurt the most. The players must either fight him or avoid him at all costs, but considering all you get are wood swords, I recommend against fighting him. So they must keep going, until they reach the exit. (EVEN IF YOU KILL THE SLENDERMAN YOU STILL HAVE TO FIND THE EXIT)