The plan short snappy idea's

Take a picture of the qr code, this will link you 2 a website, on this website will be a question from 1 of the 6 categories.
If you get the question right you will get a piece of pie and a new qr code which will give you a clue to wear the next qr code is.
if you get it wrong you will have to find another code and the one you picked will be invalid.
on the same website there will be a twitter feed for people 2 speak 2 other people playing the game. And also there will be a Facebook group for it.