For this Experimental Mapping Challenge, entrants had to make a map no larger than 1,000,000,000 Hammer Units. In the real world, that would be a cube about 20 metres long, wide and high.
The actual proportions of the map were left to the mappers. The limit was the cubic capacity.
This limitation forces mappers to think about how well they use the space.
The mod contains 13 official entries and 3 bonus entries.