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The Independent Book of Super Sudoku, volume 2
The Independent Book of Super Sudoku volume 2 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 ... more »column.« less