Click on the cube to choose and rotate it around the axes. Task: all left and right sides of this cubes must have different colors. All tops, bottoms, backs, and fronts of this cubes must have different colors. The sides between cubes must have different colors. Use X, Y, Z buttons on the screen. Use 1,2,3,4,5,6 buttons to swap the cubes.
https://www.youtube.com/watch?v=_VFWqQu96Oc