A free app for Android, by Dragon Sword.

Block Rainbow Dragon Sword is a 3D sandbox building game. It allows you to build a block-based world in creative mode or survival mode. In survival mode, you need to craft weapons and armor to fend off dangerous mobs. You can also do farming and fishing.

With Block Rainbow Dragon Sword, you can do a lot of things. You can build cities in 3D, with buildings, streets, and even streets in the city. You can build and destroy blocks and get resources such as wood, iron, gold, and gemstones. You can also craft items like swords, axes, shields, bows, and guns. You can also build an airplane and a ship.