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Reporting a problem with a challenge

The more we know, the faster we can fix it. It helps to include:

• which challenge, and what happened compared with what you expected;
• your device and browser, for example "iPhone 13, Safari" or "Windows laptop, Chrome";
• how you were responding: mouse, keyboard, touchscreen, wired or Bluetooth headphones.

For questions about results, the page for each challenge explains how its result is calculated, and the methodology page covers timing in browsers in general.

Suggesting a challenge

We add challenges that have a clear, measurable result and work well in a browser on a phone as well as a computer. If you have one in mind, tell us what you would do and what the result would be.

Privacy requests

We don't have accounts and don't store your results. For anything about analytics data or this site's privacy practices, see the Privacy Policy, then write to us at the address above.