The pentatonic scale is the first scale most guitarists learn, and the one they keep using: five notes, two on every string, in five box shapes that cover the neck. This trainer shows each box in any key, minor or major, with the root notes picked out and the finger for every note, so you learn the shape and where the roots sit inside it.
Then it shows how the boxes join. “Box 1 → 2” puts two neighbouring boxes on the neck together: the notes they share are marked, and the route up plays box 1, slides up one string into box 2 and finishes there. Learning those joins is what turns five separate shapes into one map of the neck. “Whole neck” shows all five joined.
Add the blue note (♭5 in minor, ♭3 in major) to turn the pentatonic into the blues scale. Play any box up, down and in patterns at your own tempo, with each note lighting up as it sounds.
Then play with a band: drums, bass and rhythm guitar from the backing track engine, in the same key, in a blues, rock, funk, country or pop style. Turn on “Move to the next box” and the trainer moves you up a box every few bars, in time, so you practise travelling the neck the way you will when you solo.