Virtually a modern fitness studio for the brain, 150 diverse puzzles help to keep minds flexible and to boost mental stamina in logical and mathematical thinking. The challenges posed by this new... 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.