Play 2D

The 2D mode shows notes as a falling note highway: ten lanes (one per harmonica hole), each note a colored “comet” with a tail sized to its duration, scrolling down toward a fixed hit line.

• Notes are colored by breath direction — blow and draw each get their own color, shown in the legend beside the highway.
• A note recolors gold the instant it’s hit, and red if it’s missed.
• The hole strip along the bottom mirrors your harmonica, live — useful for double-checking which hole/direction a note actually wants without reading the lane position.
• Optional hole-number labels (Options → Note labels) replace the plain up/down arrow on each note with its actual hole number, if you’d rather read “4” than work out the arrow from the lane.
• The 12-bar chord grid, metronome, technique legend, and score/combo all sit in the HUD to the side of the highway.
• A tab-notation ribbon shows the current musical phrase’s notes as plain text (e.g. -4' +5 -4) as they come up — handy if you’re more comfortable reading harmonica tab than the highway.

Everything else — scoring, pausing, looping, adaptive difficulty — works identically to Play 3D; see Playing a Song for the shared details.