Master the fretboard by shape. Pick a root pool, then a challenge — single note, triads, or pentatonic scales — and find every spot on a 22-fret board where its tones live. The root is marked R; the other tones show their interval from the root in semitones. Real-time pluck synthesis (Karplus-Strong) gives audio feedback for every press.
How to play
Pick a root pool — Natural or Chromatic — then a challenge (single note, triad, or pentatonic).
A target appears at the top — a root note plus the challenge (e.g. C minor triad).
Tap every fret that belongs to it — including open strings (the dashed rings near the nut). The root shows R; the other tones show their interval from the root (e.g. minor triad = R 3 7).
Find them all to set a new best time. Wrong taps flash red and show that note's interval from the root.