You will see a pair of notes displayed, decide whether they are a chromatic whole step or a chromatic half step. Be aware of the clef, the score will change randomly between bass and treble clef.

Chromatic half steps should feel easy as they really just require a sense of how accidentals work. If you think of the natural note as the center, a sharp is simply up one half step, a double-sharp is up two, a flat is down one half step, and a double-flat is down two.

Also, each row on the table below is a half step apart, so to find the distance from flat to sharp (for instance), you can simply count 1 half step from flat to natural, and 1 more half step from natural to sharp. This means there are two half steps (one whole step) from flat to sharp.