Marble Cube is the most difficult version of the Happy Cube family and gets its name from its marbled foam. This challenging brain teaser puts a huge smile on your face. Fun and brain training united! Several puzzle challenges can be tackled: start with the blue puzzle and make a perfect cube with the 6 puzzle pieces. Now cube in increasing difficulty the green, yellow, pink, red and purple puzzle. Then puzzle the pieces back into their frames. Easier said than done! Ultimately, create impressive puzzle constructions while combining puzzles together. Countless hours of fun guaranteed! Each of the Marble Cubes has a different shape and color and comes with several solutions. The names of the cubes refer to remarkable citizens of the world. The blue Marble Cube for instance refers to Martin Luther King, the famous civil rights worker. The 6 puzzles come flat packed in their frame, 6 different ones together in an EcoPack with no extra waste material or air. When cubed the brain teasers are sized 4 cm. They are all designed and manufactured by Happy in Belgium, for 1 to 6 puzzle fans aged 9 years and up. Skills: Lateral thinking, problem solving, spatial thinking, fine motor skills, math, self-confidence Tip: Washing your Marble Cube puzzles at 30° C can be a great refreshment for your toys.