Sudoku puzzle is a powerful tool for developing a child's brain and mental capacity. People who are able to quickly solve Sudoku puzzles usually have a higher IQ than those who struggle. The more your child practices and the quicker he/she gets, the more good is being done for their IQ.
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.