Sharpen your mind with USA TODAY Up and Down Words Infinity, a new puzzle book concept based on the hit puzzle featured each day in USA TODAY. In Up and Down Words Infinity, the second half of an answer becomes the first half of the next answer. Once started, Up and Down Words Infinity don't stop. The last half of the answer on the bottom of a page becomes the first half of the next answer on the following page. The book becomes one connected puzzle that can be played in sections. Solvers can work forward or backward from anywhere in the book. Packaged in a compact 4 x 6 trim size, USA TODAY Up and Down Words Infinity is the perfect puzzle book for the commute or the waiting room. The book fits easily into any size bag or briefcase.