Aleksandr Anufriyev 
The Magic Crosses Cubes 3×3 and 4×4 

Each cross has 4 triangles.You can rotate crosses around the axes.You can swap crosses.Task:All triangles on the bottom row must have different colors.All triangles on the top row must have different colors.All triangles in the central row on the right sides of the crosses must have different colors.All triangles in the central row on the left sides of the crosses must have different colors.All triangles in the columns follow the same rules.All triangles between crosses must have different colors.