Watch the flashing sequence and repeat it. A new color is added each round.
Desktop: `1/2/3/4` or Arrow keys to match colors, `P` pause, `R` restart, `F` fullscreen.
Mobile: tap the colored pads or use the on-screen color buttons.
Resume when you are ready to continue your sequence streak.
Origin: top-left of the canvas. X increases right, Y increases down.