Terms of Service

The Service

The Site (sudoku.sixturkies.com) is a free sudoku app run by one person as a personal project ("we", "us"). You can play puzzles right away with no account — we quietly start a guest session for you so your progress is saved as you go. Create a free account whenever you want that progress to survive clearing your browser or to follow you to another device.

Whether you're playing as a guest or signed in, you can play puzzles from the library or build your own, with your progress saved automatically, adjust your default settings, and delete your own puzzles or plays whenever you want. The settings page also has a contact form if you run into a bug or have a question.

A guest session is identified only by a cookie on your device — nobody but you can reach it, and we don't ask you to explicitly delete it. Instead, a guest session that goes unused for 30 days is deleted automatically; come back before then on the same browser and everything picks up right where you left off. Sign up any time to keep your progress permanently and play from any device instead.

You need an email address and a password to sign up, and you'll get a verification email before your account is usable. One account per person. You can delete your account at any time from the settings page — doing so deletes your puzzles, plays, preferences, and any messages you sent us. You must be at least 13 years old to use the Service.

Rules

Don't create more than one account, share your login with anyone, try to access other people's accounts or data, scrape or bulk-extract content from the Site, abuse the contact form, or use the Service to break the law. We can suspend or terminate accounts that break these rules.

What we track

To run your account, we store your email address and your password as a one-way hash — never in plain text.

We track your in-game actions — puzzles you play or build, moves you make, and how you use the app — for our own performance monitoring, statistics, and to decide what to build next. We also collect standard technical data like IP addresses and browser info to keep the Service running and secure.

We don't sell your data or share it with third parties. If you've signed up, you can delete your account and everything tied to it at any time from the settings page; an unclaimed guest session is deleted the same way automatically after 30 days of inactivity (see "The Service" above). Questions about any of this? Use the contact form on the settings page.

Public profiles

Signed-up users can choose a username and turn on a public profile page showing their puzzle stats — accuracy, streaks, and techniques mastered. This is entirely your choice: a profile is private by default, and nothing about your play is shown on a profile page until you turn that setting on yourself from the settings page.

Once you make your profile public, anyone with its link can view it — we don't list, search, or promote it anywhere ourselves. You can switch it back to private, or change your username, at any time from the settings page, and switching it back to private removes the page for everyone but you right away. Deleting your account removes your profile along with everything else tied to it.

Accepting a friend request is also a choice to share this page: once two accounts are friends, each can view the other's profile regardless of the public/private setting. Removing the friendship removes that access too, unless the profile is otherwise public.

No Promises

The Service is provided "as-is," with no warranties of any kind, express or implied. We don't promise it will be error-free, secure, or available without interruption, and we're not liable for any loss or damage — including lost puzzles or progress — arising from your use of it, to the fullest extent the law allows.

Availability

This is a free personal project, run at our discretion. We may change, suspend, or shut down the Service, in whole or in part, at any time, for any reason, without notice. There's no guarantee it will stay online.

Ownership

We own the app itself — the code, design, and puzzle-generation logic. Your gameplay data is yours; using the Service just gives us permission to store it and show it back to you.

Changes and Contact

We may update these Terms at any time; continuing to use the Service after a change means you accept the update. If you have questions, reach us through the contact form on the settings page.