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When you answer a question, the device briefly vibrates to give feedback. This uses the browser's Vibration API, which is not supported by every mobile browser.
If your device supports it, make sure vibration is turned on in your phone's sound or accessibility settings.
Your score is mostly based on how many multiplication facts you have mastered.
The graph shows your most recent 10 quiz results by default. Use "Show all results" to see everything saved on this device.
The chart zooms in to show progress clearly, but the mastery score is always out of 100.