A free app for Android, by Biaa Studio.

Building Builder Rainbow Pro is a game that gives you an opportunity to explore infinite worlds and build whatever you want from the simplest homes to the greatest castles. The game is based on the idea that life is a challenge, and that we need to overcome them to be able to live a meaningful life.

In the game, you will be exploring a 3D world, where you can dig into the earth to find blocks of various materials, such as wood, iron, stone, etc. These blocks will be your building blocks. You will need to create a house, a castle, or another large building in order to survive and thrive. Your house will be your home, and your shelter from the outside world.