Voxelands

Voxelands is Fun, Free and Fast, or so it says on their homepage. It's also a sandbox-style game with incredibly big worlds: almost a quarter of a million cubic kilometres per map. I have to admit I have a hard time putting that into perspective, but it sure sounds huge! Voxelands also has hundreds of block types, creatures and both single and multiplayer. The latest release is from yesterday, and is called 1604.00. It contains mostly fixes, but new features seem to be added often as well - and that is upon a base already filled with features. If you want to build some worlds, Voxelands might be the place to do it.

Blocky, but with lots of little details.