Regular Sudoku has a 9x9 grid with one of every digit 1-9 in every row, column, and 3x3 group. WTF Sudoku has a 25x25 grid with one of every letter A-Y in every row, column and 5x5 group. Regular... This description may be from another edition of this product.
ThriftBooks sells millions of used books at the lowest
everyday prices. We personally assess every book's quality and offer rare, out-of-print treasures. We
deliver the joy of reading in recyclable packaging with free standard shipping on US orders over $15.
ThriftBooks.com. Read more. Spend less.