Collins Bumper Book of Su Doku book 1Lose yourself with these challenging number puzzles. Packed full of 300 Su Doku puzzles to test your mental dexterity, powers of logic and deduction. You will find 100 easy, 100 medium, and 100 hard puzzles in this collection, so you can monitor your progression through the difficulty levels. Keep your mind sharp and test your powers of deductive reasoning. Ideal for whiling away the time while travelling, on holiday, or relaxing at home. You will