I've got some somewhere, but I don't think they did QR codes and they certainly didn't launch a link - that's what she enjoys. No idea why, but I'm not going to discourage her from anything that gets her interested in technology. We're going to get a t-shirt printed for her with a QR code saying "If found, please ring [phone number]".

First thought: this might be a neat Android game Second thought: this has already been implemented

And..

https://play.google.com/store/apps/details?id=com.fawepark.a...

(by the way, this displays in an awful Spanish for me, because of my default language)