A free program for Android, by Knuckle Games.

Explore and build your way through the endless world of the game, full of challenges, to reach your goal. You can find a lot of different things, like blocks, tools, weapons, and armor. But the most important thing is that you can create your own house and build a whole city with different rooms and buildings. 

Block Craft – Open World Sandbox is an open-world sandbox game. It is a free game with no limits, where you can create your own adventure and have a lot of fun.