I am addicted to puzzles. I am constantly trying new games on the iPad and my phone. When I was younger I was addicted to word finds and crossword puzzles. I am NOW addicted to Rich Rollo's Number Cross Puzzles. I love that this very fun puzzle book challenges my brain in a different way than the computer based games. I love having the book in my hands, folding over the cover and trying to figure out the puzzle! Ever since I received this puzzle book it has stayed in my purse and I take it out anytime I have a few moments between activities If you are a lover of puzzles you must try this puzzle book! 5 stars!