1. Standard blocks are 1m x 1m x 1m.
2. Vertical limit is currently 256 blocks. We’ve considered increasing this – but it’s parked at the moment whilst we work on other features.
The game worlds are not limited to 16km x 16km. They can be much greater than this. The real limits come from the h/w the world is run on and the # of simultaneous players (and # of entities) in the world.
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