Why Register?

Registered users get a lot of advantages.

Why Do You Need My E-mail Address?

Online Sudoku uses advanced and nearly impenetrable security techniques to keep your password safe. The problem is, it's so safe that we don't even know what your password is. We can tell, of course, if what you enter to login was what you entered when you registered, but if you want us to tell you, in plain-text, what your password is, you're out of luck. For that reason, we keep your e-mail address on file. If you ever forget your password, you can have an e-mail sent to you that will allow you to change it to something that you'll hopefully then be able to remember. Also, requiring an e-mail address makes it easier for us to ensure that one person doesn't register for 20 usernames.

Plus, we'll never give your e-mail address out to anyone—ever. We promise. For more info, check out the privacy policy, below.

Privacy Policy

Online Sudoku treats its user's e-mail addresses as confidential information and will never release them to any third party. E-mail addresses will be used solely to reset passwords when requested by the user. Online Sudoku reserves the right to use a user's e-mail to contact them in the event that something is wrong with their account.

Signing up with Online Sudoku will NOT sign you up for any mailing lists. Your e-mail will be used solely for security and maintenance purposes.

Let me play Online Sudoku!