Here’s a very good example of using QR codes effectively in a campaign. This example from Sony, publishers of PS3 exclusive Uncharted 3: Drake’s Deception, shows a very nice example of responsive advertising through the implementation of a QR code onto print media. As you can see, the QR code is prominent on the back cover of the free magazine with a clear CTA “Scan the code. Join the adventure”. The QR code then links off to a very nice mobile micro site, actually served in a banner. The ability to purchase the game through Amazon is a very nice touch.