Keep your mind young and your memory sharp with 480 Jigsaw Sudoku Variety Puzzles Book. Scientific research has shown that solving logic puzzles as Sudoku keeps your memory sharper and your mind younger. There are 6 different types of puzzles in this book, Centre-dot Jigsaw Sudoku, Even-odd Jigsaw Sudoku, Asterisk jigsaw Sudoku, Greater than Jigsaw Sudoku, XV jigsaw Sudoku and Samurai jigsaw Sudoku. The book has a total of 480 easy to hard puzzles with solutions. Jigsaw Sudoku is variation of classic sudoku where the 3x3 blocks are no longer square, instead it's irregular region of 9 cells, and all numbers from 1 to 9 must be fit inside with no repetition in any row or column or region. As twisted as it sounds, these puzzles are challenging and addictive. The Centre-Dot Jigsaw Sudoku puzzle has an extra block consists of the centre cells of the nine regions. The centre dots or cells are shaded and all sudoku rules apply i.e. no repletion in any row or column or block. Even odd is a variation where clues are given in the form of circles and squares. The cells that have circles need to be filled in with an odd number. While the cells that have squares needed to be filled in with even number. Of course, all sudoku rules must be followed i.e. no repletion in any row or column or block. The Asterisk Jigsaw Sudoku puzzle has an extra block formed from nine scatted cells (if connected they will form an Asterisk). The 9 Asterisk cells must be filled with the numbers 1 to 9 with no repetition. The cells are shaded and all sudoku rules apply i.e. no repletion in any row or column or block. Greater than Jigsaw Sudoku is a very challenging and twisted Sudoku where the signs > (greater than) and XV Jigsaw Sudoku is an easy but fun sudoku variation where the neighbour cells that add up to 5 have Roman five (v) in between. And the neighbour cells that add up to 10 have Roman ten (X) in between. This variation is a fun and relaxing stretch for your brain. Samurai Jigsaw Sudoku has five overlapping 9x9 grid. Each row, column, and irregular block (surrounded by bold lines) contain all numbers from 1 to 9 (no number is repeated in any row or column or block). The key to solve the Samurai Sudoku is to use the clues from one grid to solve another. Features Size: 8 x 11.5 inch (large size) with softcover and paperback binding. Pages: 132 pages with full-page 480 different puzzles. (6 puzzles per page so it's compact for easy carrying and holding). Plus, the Answers of all the puzzles at the end. Stretch your brain with this unique selection of fun and challenging twisted Jigsaw Sudoku Variety. Scroll up and order your copy.