This document contains 12 QR codes that when scanned reveal a reward/prize.
Rewards consists of things such as sitting in the teacher's seat, lunch with the teacher, no shoes in class, popcorn snack for the class, music time for the class.
The majority of the rewards will not cost you anything.
You simply print the QR codes, cut them out, and laminate them. Students are then ready to randomly select a code, scan it, and see what they have won.