For anyone who loves the challenge of Su Doku but manages to solve them within minutes you can now enjoy the extended mental workout & ultimate endurance test of a five grid interlinked system This is Su Doku multiplied every column row & 3x 3 box must contain the digits 1 to 9 Where the puzzles overlap the rows & columns do not go beyond their usual 9x 9 length but the interlocking boxes give you more clues
- & more complexity With another 100 new Samurai puzzles to vex you for hours lose yourself in the four levels of this book 10 Easy 40 Mild 40 Difficult 10 Super difficult Even the speediest of Su Doku solvers will be agonising over these ultra-complex extended brain-teasers These are the most difficult Su Doku puzzles in The Times range