I recently whipped up a little web based puzzle game inspired by QR codes, Sudoku, and error correction. The original vision was little more challenging, with more sophisticated error correction, but maybe that will be in version 2. 0. Or maybe it will just have more advanced levels in the future.
QRacker
A Parroty Parity Parrody
https://firstnormalform.com/code/qracker
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