Each set comes with six coloured puzzles, flat-packed. The first part of the challenge is to make the six cubes, each one a little harder than the previous. Once they have been made, the next step is to fit them all back into their flat packs, which is easier said than done! Multiple shapes can be made out of the pieces from each cube. The Happy Cube Junior is the easiest of the range, specifically designed for children aged 4-7.