I wonder if it would be possible to create a QR code that only differs for very few black squares, and tell people to blacken said squares depending on their re

I wonder if it would be possible to create a QR code that only differs for very few black squares, and tell people to blacken said squares depending on their reply. It could be a see-through card - the first page shows the QR code, with holes where the answer dots go. The second page only shows the answer dots to blacken out. Would at least be geeky fun.