Each row adds an accent (1 → 2 → 3 → all), and each column adds a diddle. Pick cells to drill, then play them 4–2–1: cells are grouped in chunks of four, and each chunk runs through four times, then twice, then once before moving on.
Getting started
Pick your grid. Use the accent and diddle filters to narrow down what you want to work on. Try Triplets for a different feel.
Build your exercise. Tap individual cells, or click a row label to grab the whole row at once.
Generate. Your selection is arranged into a 4-2-1 plan — every cell played ×4, then ×2, then ×1, in chunks of four.
Press Start and follow along. The active tile lights up and a small dot tracks each note, including diddles, so you can sync with the click.