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Happy Cubes are small Foam puzzles assumbled of pieces of about 4cm by 4cm by 8 mm in size. The puzzles come in groups of 6 such pieces of the same color and texture. When assembled, these pieces make up a basic cube of about 4cm by 4cm by 4cm in size. There are four families of Happy Cube puzzles, each containing 6 seperate cubes which are differentiated by color. Furthermore, Each family has a unique texture and difficulty. The Little Genius - Textured with various icons of foods, vehicles etc`. these are the easyest cubes to build. The Happy Cube - Plain color texture. medium difficulty. The Profi Cube - Interleaving two color texture. slightly harder to build. The Marble Cube - Colored marble texture. the hardest difficulty. Pieces of several different cubes can be joined together to make up larger and more Complex structures. This process is usually very difficult and tedious to perform manually (this is where the Happy Cube Solver comes in). The Happy Cube puzzles were invented by Dirk Laureyssens in 1986 and are manufactured by a belgian Company named Happy n.v. At some point they were also known as "Cube It!" cubes and "wirrel warrel".