Mobs you kill drop blocks on the place they die. You have to lure Mobs and tacticaly kill them to create a staircase you can use to get to the top of the Tower in the middle of the Arena. Mob Tower Map includes 4 difficulties and is Singleplayer and Multiplayer compatible.
Mob Tower Map Screenshots:
How to install:
Download links for Mob Tower:
For Minecraft 1.8