Pick a scale on the left.
How to review. Click a note and type 1–5; the cursor walks on. ← → move along the run, ↑ ↓ between the rows, [ ] between scales.
R ticks the row reviewed, G the whole scale. A red digit is a thumb on a black key. The chips set a row to an engine's answer: book is the cyclic textbook pattern, scalar piano-fingering's shipped set, wizard its rulebook DP, magician its ergonomic optimizer.
⟲ from 2 oct spreads a two-octave leg over one, three and four octaves; ⇄ copies a leg reversed into the other where the notes are the same run backwards. Changes save by themselves and reach the game within ten minutes.