A logic puzzle that is a set of 15 equilateral square elements with numbers on them. All elements have numbers from 1 to 15 and are placed on a field in the water of a 4x4 square with 1 empty space that allows you to move the square elements. The goal of the game is to move the squares, arrange them by numbers, using the free "window", while making the fewest moves. Whether you can assemble this floor depends only on you. Challenge yourself.