Educational use
The site is provided for general learning and entertainment. Calculations are explanatory and are not navigation, surveying, or professional advice.
Challenge boundaries
Each game and tool uses the displayed rule and a finite reviewed dataset. An accepted answer applies to that challenge, while a rejected answer may still be valid in another dictionary, spelling convention, or game.
Fair play
Do not manipulate Duel rooms, create abusive ranking records, impersonate others, or use automated solvers in public competition. Solo scores and local pass-and-play results must not be presented as server-verified Duel records.
Public names and room links
Choose a public player name that does not impersonate, threaten, or expose another person. Treat a private Duel link as an access credential and share it only with the intended opponent.
Acceptable use
Do not attempt to disrupt the service, probe private systems, automate abusive traffic, or republish substantial parts of the site as your own.
Availability and corrections
Features, rankings, challenge datasets, and explanations may change when errors are corrected or a method improves. A correction normally preserves the existing page URL so references and reports continue to reach the same resource.
Understand related rights and data rules
See the privacy policy for server and browser data. copyright notice for reuse and attribution boundaries. support guide for responsible troubleshooting.