Contact Us
Last Updated: September 8, 2026
We love hearing from fellow puzzle solvers, educators, mathematicians, and web developers! Whether you have spotted a bug, want to discuss a complex deduction technique, or have business or advertising inquiries, our team is here to assist you.
1. Get In Touch Online
Please fill out the form below. Inquiries are routed automatically to the appropriate department to ensure prompt attention.
2. Direct Department Directory
If you prefer reaching out via your own email client, please direct your communication to the relevant departmental inbox:
Player Support & Feedback
Puzzles, UI & suggestionsPrivacy & Legal Affairs
GDPR, CCPA & DMCA noticesAdvertising & Sponsorships
AdSense & direct campaignsBug & Security Reports
DLX algorithm anomalies3. Expected Response Times (SLA)
We value your time and take every inquiry seriously.
- Standard Inquiries & Bug Reports: Within 24 to 48 hours (Monday to Friday, 09:00 - 18:00 UTC).
- Data Privacy & GDPR Requests: Within 30 days as mandated by European Union data protection regulations.
- Critical Vulnerabilities: Acknowledged within 12 hours.
4. Quick Troubleshooting & Frequent Answers
Before sending a message, you may find an instantaneous answer to your question below:
Q: Why did my saved game or statistics reset?
Sudoku Pro stores game state locally in your browser's localStorage. If you browse in Incognito/Private mode, use aggressive browser cleaner extensions, or clear cookies and site data, this local storage is wiped by your browser.
Q: Do your puzzles ever require guessing?
Never. Every single puzzle generated by Sudoku Pro is verified via our Donald Knuth DLX dual-solution verifier. There is strictly one unique solution, solvable purely through logical deduction and candidate elimination.
Q: Is Sudoku Pro really 100% free?
Yes! All 6 difficulty levels, print sheets, daily challenges, solver tools, and tournament modes are free forever. We sustain our infrastructure through non-intrusive standard Google AdSense advertising.