500 Sudoku Variants Medium Level: Jigsaw Sudoku, Sudoku X, Windoku, Girandola, and Argyle Sudoku

Keep your mind young and your memory sharp with 500 Sudoku Variety Puzzles Book.

Scientific research has shown that solving logic puzzles as Sudoku keeps your memory sharper and your mind younger. 

There are 5 different types of puzzles in this book, Jigsaw Sudoku, Sudoku X, Windoku, Girandola, and Argyle Sudoku. 
The book has 100 puzzles for each type of medium level, a total of 500 puzzles with solutions. 

• Jigsaw Sudoku is a variation of classic sudoku where the 3x 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 fun as it sounds, these puzzles are challenging and addictive. 
  
• Sudoku X is like classic sudoku in the rules where no repetition of numbers in any column or row or 3x3 block. The difference between classic Sudoku and Sudoku x or diagonal sudoku is the extra constrain or rule where the numbers 1 to 9 must fit in the diagonal lines and no repetition of any number in the diagonal x. 
  
• Windoku has extra four (3x3) blocks (shaded) where the numbers 1 to 9 can fit in without repetition, so in total there are the 9 traditional 3x3 blocks and the extra shaded blocks. 
• Girandola Sudoku has the same rules as classic Sudoku plus an additional rule where the scatted shaded cells must contain the numbers 1 to 9 with no repetition in those shaded cells. 
  
• Argyle Sudoku has the same rules as classic Sudoku and the extra rule of no number is repeated in any of the diagonal lines shown. Despite the condensed looks, solving Argyle puzzles are not that hard.

Specifications

• Size: 8 x 11.5 inch (large size) with softcover and paperback binding. 
• Pages: 117 pages with full-page 500 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 Sudoku Variety. Scroll up and order your copy.