More than 100 puzzles are included, split into a variety of different types to make it as varied and challenging as possible. There are logic and mathematical puzzles, mazes, colour sequence puzzles, and visual teasers. All answers and explanations are included. Rubik's Cube has been popular since the early 1980s, when Professor Erno Rubik developed a 'moveable art piece' for his architecture students. That became the Rubik's Cube and was a massive craze around the world.