The Book of Kakuro: And How to Solve it by Gareth Moore
This is a fascinating and addictive combination of numbers and logic, with the interconnectedness of crosswords, Kakuro is a game for everyone - all you need to be able to do is add two numbers together. The Book of Kakuro: And How to Solve It contains full instructions to the game, along with hints, tips and strategic guides, and puzzles for beginners to experts.