Each card says what you want to do. You press the keys that actually do it, in order — no multiple choice, because recognising a shortcut on a cheat sheet is not the same skill as recalling it with your hands.
Answers are scheduled in five Leitner boxes: get a card right and it comes back tomorrow, then in 3, 7 and 21 days. Get it wrong and it drops back to today. The counter above tells you what is due, which is the only reason to come back.
Every answer on this page is made of ordinary printable keys, so nothing you press here collides with one of your browser's shortcuts. Press Tab to get out of the key pad.
No keyboard? Switch to tap mode and pick the answer instead. Your progress is kept in this browser's local storage and is never sent anywhere — there is no account and no server to send it to.