Checker Cruncher
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Creating an account has many benefits.
A persistent rating to show your skill and progress.
Problems selected based on your ability and desired difficulty.
A stored history of attempts to review your mistakes.
Access to the forums to chat with other players and the site developer.
We'll never share, sell, or spam your email address.
It's totally free!
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Checker Cruncher uses javascript to create most of the GUI. Without javascript it will have only very limited functionality. We also use browser cookies to manage user sign in and preferences.