Do you ever have one of those moments when you're playing a game on your NOOK, take a look at the clock, and realize you've been playing non-stop for the past hour?! That is pretty much what just happened to me and the fantastic game app Bloons TD 4 by Digital Goldfish. There are hours and hours of fun to be had with this game that seems to never run out of challenges. The graphics are great, there's zero lag time, and its SO easy to learn how to play. Once you've mastered the basics and want more of a challenge, you can "up" the difficulty or switch game modes. I know you might be thinking “another tower defense game? What makes this one so special?” Well first off, there are lots of towers, way more than the average tower defense game, plus many different maps which equals a variety of strategies to keep things interesting. It’s also just silly and entertaining. The premise of the game is monkeys attacking balloons, which makes this a game I can easily share with my whole family. I ultimately believe that his game will be a classic. It’s one of the best apps you’ll find if you’re interested in tower defense/strategy games. You will never look at a balloon the same way again!