An assortment of 3 brain-training books: Code Breaking, Smart Logic and Critical Thinking, to challenge the mind. Each title contains differing levels of puzzles to battle against the clock and each give readers a good cerebral workout! The Lagoon Groups range of licensed Rubiks puzzles bring together art and intelligence through beautiful vintage designs and mind-bending play. Each product has a Rubiks challenge level, so you can select your level of difficulty.