Following on from the hugely popular Su Doku phenomenon, Ka Kuro Classic is the exciting new brainteaser from Japan that will seriously challenge both expert and novice puzzlers alike! Ka Kuro requires a blend of logic, strategy and a keen mind in order to resolve the myriad of mathematical combinations that each new puzzle creates. It's just like a crossword - but with numbers! With an inexhaustible supply of puzzles, Ka Kuro Classic provides truly limitless game play on your PC & laptop - and as you can quickly print puzzles to take with you - it's also ideal for commuting, holidays or simply relaxing in your favourite chair!