What do you think about this QR code game idea this Halloween?

I came up with this idea for a Halloween game for booths or In front of coffee shops.

The concept is simple: customers scan a QR code to play a quick “trick or treat” game they could win a small discount, freebies or sorry.

Do you think something like this would actually work?
Would customers be interested enough to scan and play?

Anyway just sharing this idea. What do you think?