The lesson
The Daily Puzzle is the smallest practice unit in the app, which is what makes it the only one people actually keep. A single puzzle a day beats a two-hour session every third week, because recall improves with the number of separate occasions you retrieve something, not with the total minutes spent staring at it.
The streak is a hook, not a goal. What makes the day useful is the thirty seconds after the puzzle: write down what the puzzle asked, what you answered, and — if you were wrong — the specific reason. Not 'I got it wrong'. Something like 'I heard the third as major because the melody sat on the fifth'. Reasons repeat. When the same reason shows up three days running you have found your actual weak spot, and that is what Focus Mode is for.
Speed is worth nothing here. If you can solve the puzzle instantly, slow down and justify the answer out loud before submitting; if you cannot justify it, you guessed correctly, which teaches nothing. Guessing right is the most expensive outcome in ear training because it feels like learning.
Protect the streak with a floor, not a ceiling. On a bad day the deal is one puzzle, one line in the log, done. Never let the ritual become something you can fail.
