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Happy Cubes are a set of mechanical puzzles created in 1986 by the Belgian toy inventor Dirk Laureyssens. The company "Happy bvba" has the exclusive license to manufacture and sell these puzzles ().Happy Cubes are also known by a number of other names, among them: "Cube It!" cubes, "Wirrel Warrel" (in the Netherlands), "I.Q.ubes" and "Cococrash" (in Spain and Portugal). The Happy Cubes were made of 8mm-thick ethylene-vinyl acetate foam mats (also known as EVA). The tiles were based upon a 5x5 matrix where the outer squares may be present or absent. The central 3x3 kernel was fixed. Initially the puzzle is assembled into a 2-dimensional, flat 2x3 piece rectangle fitted into a frame. The basic challenge is to construct a perfect, 6-sided cube out of these 6 pieces. Usually, there is only one way to fit the pieces into a complete cube and it can be reached with various levels of difficulty by trial and error. ==Variations== There are four families of Happy Cube puzzles, each containing 6 different cubes. Each family has a unique texture, style and difficulty level. Within each puzzle family the cubes are differentiared by color. The four families of Happy Cube puzzles are: * The Little Genius - Textured with various icons of foods, vehicles, emotions etc.'. These are the easiest cubes to build and are designed for children aged three to seven years. * The Happy Cube - Plainly colored with a single color each and with no texture, medium difficulty. These are the original cubes that were designed by the inventor in 1986. * The Profi Cube - Textured with two interleaving colors, slightly harder to build than the Happy Cubes. There are two versions of this family, the first is colored with one dominant color and a black background and the newer version is much more lighter in shade, replacing the black background with a second dominant color similar in shade to the first one. * The Marble Cube - Textures as colored marble, the hardest difficulty. 抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』 ■ウィキペディアで「Happy Cube」の詳細全文を読む スポンサード リンク
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