How practice and progress work
Practice favors unseen facts and facts that need more work, with occasional familiar ones. A missed or hinted fact returns later when there is room in the session.
In Challenge mode, a first-try answer within 3 seconds without a hint counts as quick. Normal mode has no speed target. Neither mode has a countdown or time limit. A fact is learned after 5 independent answers, or 3 quick Challenge answers, across at least 2 days. A mistake gently reduces the square fill; completing the correction adds a little back. This is a practice cue, not a test of ability.
The map tracks each direction separately: knowing 3 × 6 does not automatically mark 6 × 3 as learned. Zero is available in Explore and Practice, but the map covers 1–12. Progress is saved only in this browser. Moving the file, clearing browser data, or switching devices may start a new record.