I remember first playing Minecraft, and describing it to friends as "It's like playing with lego, but on the pc".
Well, now we have LegoWorlds (manually linked - not adwords) on the PC. It's like minecraft, but with lego..
I picked up the early access because...it's lego. So far the vehicle controls are a bit shaky and the building / camera area is quite tricky to use. Otherwise it's a fairly solid game, with procedurally generated biomes ranging from spooky forest to candy land which can be explored.
Like all lego games, you can bash things and receive studs, which can be used to unlocked any discovered vehicles, animals, characters etc.
They also have a single "Lego Set", which I hope means they will soon import more. I'd love to get the Hogwarts set added, although I get the feeling the Sets may be DLC later on.