This is a 99% accurate recreation of the Achievement Hunter map for their 12 Towers Let's Play.

How to Play
Each player has the goal to collect 12 towers of 4 pieces of the same material. All blocks that are stackable are allowed. However, only 1 wood structure and only 1 stone structure are allowed, meaning that you cannot have wood planks as one tower, crafting tables as another, or stone as one tower, and furnaces as another... and so forth. The two upside down towers are reserved exclusively for nether materials- a nether portal is hidden close to the building for convenience. No killing is allowed inside the building, and no stealing of towers is allowed inside the tower.

Additional Notes

All credit goes to Achievement Hunter for their map, I merely recreated it in PC.