For puzzle solvers who want the ultimate sudoku challenge, London's Independent newspaper brings together a second collection of the large and incredibly addictive super sudoku puzzles, with an expanded 4-by-4 box. In addition to the numbers 0 through 9, the letters A through F must also be put into each grid, without repeating in any row or column.
This book was a gift for someone who flys through the regular 9x9 Sudoku Puzzles and boy, was it a hit! If you are becoming bored with the 9x9 or even the Samauri Sudokus (i.e. you can solve them without writing the options down) this is a fun challenging book.
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