At the SmartGeometry 2016 we defined three independent experimental zones within our Minecraft server. That way 20,000 Blocks got the blue, orange and green test fields on which participants could try a different game design, targeted at a specific real-world use case.
HOW HIGH turns the players of 20000 Blocks into residential architects. To win the game build 5 houses. The trick is though, you need to build the needed infrastructure and public spaces to be able to create a house.