A free program for Android, by CTP-design.

Cube Alchemy – 3D blocky sandbox is an infinite world creation game where you can design and build your own world using a variety of 3D blocks. You can create your own buildings and cities, explore and survive in a variety of modes, or you can fight with other players in multiplayer mode. You can also save your worlds and share them with other players at any time.

Cube Alchemy – 3D blocky sandbox has a new sandbox mode, where you can create and explore your own world in survival mode. It’s a free sandbox game for girls and boys. Design your own 3D doll house or build a fortress with a castle – no blueprints just free custom building.