PuzzleBlocker by Nikola Kretschmer

PuzzleBlocker is a browser extension that helps you spend less time procrastinating and more time being focused. To unlock time-wasting websites – like Facebook, Instagram or Reddit – you have to solve Tangram puzzles.

Solving puzzles takes time and will make your brain think procrastination is actually hard work. At best, you will close the tab and keep working. At worst, you have "earned" the reward of procrastinating for a couple of minutes.

Read more on how it works at puzzleblocker.com

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If you have any issues, feel free to submit bugs or feedback through the provided tools of communication. Any feedback on the app or ideas how to improve it are greatly appreciated!

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This extension currently also works in Chrome.