Once the four jobs feel like home, the fastest upgrade isn't a new chord — it's color on the chords you already hold. Lift one finger and the 3rd becomes a hanging sus4; add a pinky and the plain grip turns to add9 shimmer or 6-chord warmth. Same job, same key, richer room. And when you switch out of Beginner Mode, the full palette opens up: the Lab's Color it panel upgrades whole progressions, and the quiz gains a Name the Color ear round.