- 150 unique puzzles- 5 difficulty levels- 6x6, 8x8, 9x9Fill digits in the grid such that every row, column and boldly outlined box contains all given digits without repetition. Clues are given in the form of lit segments of an LED. Only digits that contain those lit segments can appear in a given cell.
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.