This is a great use of new technology and an exciting way to get students up and moving around your classroom without losing control.
This review activity uses QR Codes (like bar codes) that, when scanned, show students a question that they must then answer to help them prepare for the upcoming test. It covers planets, space technology, asteroids, comets, and much more!
Use it as a review, a competition, group work, a quiz, or just as an excuse to get out the i-Pads (which will be required if you don't plan on letting students use cell phones, which I don't recommend!).
Enjoy, and, as always, please let me know if there is anything that I can create to help make your lessons or classroom a little more complete.