Keep your mind young and your memory sharp with 240 overlapping Samurai Sudoku Variety Puzzles Book. Scientific research has shown that solving logic puzzles as Sudoku keeps your memory sharper and your mind younger. There are 4 different types of puzzles in this book; Classic Samurai Sudoku, Diagonal Samurai Sudoku, Anti-diagonal Samurai Sudoku, and Jigsaw Samurai Sudoku. The book has a total of 240 easy to hard puzzles with solutions. Samurai Sudoku has five overlapping 9x9 grid. Each row, column and 3x3 block (surrounded by bold lines) contains all numbers from 1 to 9 (no number is repeated in any row or column or block). To easily solve Samurai sudoku, consider solving the puzzle as a whole and use the symmetry rule for the opposite areas. Use clues from one 9x9 grid to solve the other grids. Diagonal Samurai Sudoku X has five overlapping 9x9 grid. Each row, column and 3x3 block (surrounded by bold lines) contains all numbers from 1 to 9 (no number is repeated in any row or column or block or diagonal line). Antidiagonal Samurai Sudoku has an extra step to make solving the puzzles a little fun. Where the diagonal lines should only have at most three different numbers. Repeated numbers are okay in the diagonal line, that is why it's called anti-diagonal. Other sudoku rules as no repetition in the blocks, rows and columns should be followed. Jigsaw Samurai Sudoku has five overlapping 9x9 grid. The square 3x3 regions or blocks are no longer square, instead, the 9 cells form irregular twisted shape, which still has to be filled with the numbers 1 to 9 with no repetition. Features Size: 8 x 11.5 inch (large size) with softcover and paperback binding. Pages: 166 pages with full-page 240 different puzzles. (2 puzzles per page). Plus, the Answers of all the puzzles at the end. Stretch your brain with this unique selection of fun and challenging overlapping Samurai Sudoku Variety. Scroll up and order your copy.