Last updated: 14th December, 2017

Personally-identifiable information

Your privacy is very important. This website does not collect any personally-identifiable or sensitive information.

Non-personally-identifiable information

Information about your computer, including your IP address, operating system and browser type, is stored in log files and may be used for system administration purposes. This data does not identify any individual and will not be shared with any third parties.


This website uses cookies, as almost every other website does, to give you the best possible experience. Cookies are small text files that are stored on your computer or mobile device when you browse websites. The cookies on this website help to:

  • Provide statistics for puzzles - number of attempts, average solving time, etc.
  • Personalise ad content

This website does not use cookies to:

  • Collect any personally-identifiable information
  • Collect any sensitive information
  • Pass personally-identifiable or sensitive information to any third parties

If your browser is configured to use cookies and you continue to use this website, it will be regarded as acceptance of this policy. If you wish to remove or not use cookies from this site, instructions are included below, although if you do, the site may not work as you expect.

The cookies used by this site are explained below.

Session Cookie

This website uses a cookie that stores, on your computer, information about the puzzle that you're currently solving. This cookie is used to gather statistics about the number of times each puzzle has been attempted and solved, as well as the average solving time.

Google AdSense

This website uses Google AdSense to provide ads, which in turn uses the DoubleClick cookie. Neither this site, advertisers nor advertising partners can gain access to any personally-identifiable information from this cookie. The Google AdSense privacy policy can be found here.

Local Storage

In addition to the cookies above, this website stores the puzzle you're currently solving in your browser's local storage, if it's available, including any numbers you've entered, cage combinations you've faded out, etc. This enables you to continue from where you left off if you close your browser or switch off your computer and return to it later. None of this information is personally-identifiable or sensitive.

Disabling Cookies

You can usually disable cookies by changing your browser's settings. However, doing so is likely to limit the functionality of this site and many others, as cookies are a standard part of many websites' operation. If you do want to disable cookies, you can learn how here.

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