Round 01
Hear four notes or four chords. Each round uses one, two, three, or four notes at a time.
It plays again with just one note changed. Select its cell: columns are the four positions, and rows are the notes from high to low. In a chord, you need the exact note, not just the right column.
Pick your answer, then the five-second reveal moves you on and plays the next round. Press Next round or Escape to continue sooner. In duels, correct answers decide the winner; total thinking time breaks ties. Replays keep the clock running.
The daily challenge is the same for everyone and resets at midnight UTC. Your first score counts. Duels use both players’ average Elo: lower ratings get mostly melodies and easier changes; higher ratings get more layered chords and subtler changes. You both hear the same questions. Practice leaves your rating unchanged.
Your answers are saved. You can resume this session from the studio.