The first note is given. Click the staff to write the second note above or below it, as the instructions say; the two notes stack as a harmonic interval. Or type it: the letter, then b for flat or # for sharp (twice for a double, or x for a double sharp), then Enter. To change a typed note to B, press Space, then b. After a correct answer, Enter moves on. Backspace clears your note.

Piano sound: Salamander Grand Piano by Alexander Holm, used under CC BY 3.0 (trimmed and converted to mono).

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