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Learning
These are kept on this device, not in an account, so they work offline and apply whether or not you are signed in. Clearing your browser data clears them.
Explain what you got wrong
When you miss a question, practice says what you answered and, where the module has one, the reason the right answer is right. Turn this off for a bare drill that only names the answer.
Reading aids - the romaji and English layers - are switched on the pages where you use them, so they stay where you are reading rather than moving here.