Once you have enough of the QR code shown, it would become possible to start bruteforcing the other unrevealed pixels and find the actual private key. If you're smart/technically capable, you could play +EV.
To play +EV you need some awesome skills, because a blurry code will not work.
https://www.qrcode-monkey.com/6-reasons-why-your-qr-code-is-not-working
6 reasons why your QR code is not working > 3. Don’t create blurry QR Codes
But i found an awesome article from a guy who did this, i think he is the only one who can solve this game with +EV
https://medium.freecodecamp.org/lets-enhance-how-we-found-rogerkver-s-1000-wallet-obfuscated-private-key-8514e74a5433
Thanks for your reply DarkStar_ you make me learn more about the topic, but i still thinking the house should have only 1 or 2% house edge.