Notes fall from the top of the field toward the line above the keyboard. Each tile tells you what to play: a letter, an interval, a number, a chord, or a Nashville numeral depending on the level.
Hit the right key while the tile is near the line. Closer to dead-on earns PERFECT, a little early or late earns GOOD or OK, and missing the window or hitting the wrong key breaks your combo.
Play with a mouse, a finger, or your computer keyboard: A S D F G H J are the white keys, W E, T Y U are the black keys above them.
A run ends after 30 tiles or 5 misses. Clear a level at 80% accuracy or better to unlock the next one. Progress saves in this browser automatically.