About, privacy and contact
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Local data
PDF and text inputs stay in the browser tab. Sudoku progress is saved in browser local storage and can be cleared by resetting a puzzle or clearing site storage. We do not receive your file contents or game entries. Hosting still handles ordinary requests and may log network information; local processing is not a promise of total anonymity.
Contact
Contact the operator. Report a reproducible problem using non-sensitive examples; do not send identity documents or private PDFs.