Digital puzzle, a new classic educational tool to cultivate digital interest and interest. The purpose is to rearrange the number squares on the grid from left to right and from top to bottom in the shortest time with a few steps, and to conform to all equations. Features: challenge your brain and mental arithmetic; fill in the squares to make all the numbers conform to the equation; challenge yourself at different difficulty levels; train your brain anytime, anywhere! Multi language, support to fight with children all over the world.