ENDLESS FUN - The Underground Genius has over 62,000 puzzles to explore, the fun never has to end Based on The Genius Square. If you love problem-solving games like the Rubik's cube, then you'll love the Underground Genius even more A genius, mastermind, smart puzzle game that is a great learning resource and extremely fun to play The Underground Genius game boards have been based on the Transport for London (TFL) logo. The puzzle pieces have been coloured to match the official colours of the London Underground Tube lines and other TFL services. SOLO OR HEAD-TO-HEAD - Play solo, or race an opponent to beat the grid Do you have competitive friends or family? Go head to head on your next family game night or practice on your own to improve your skills, as this game can be played as a single player too GREAT FOR AGES 6 to Adult - This Happy Puzzle Company game is great for ages 6 and a great gift for birthdays, Christmas, sats & gcse revision activities, school holidays and weekends.