Guitar Staff Reading by Ear level 2 uses the mi so la note set in the key of G over two octaves. The "Hint" button shows the notes to be included in the drill. The colors indicate scale position similar to solfeggio syllables - do re mi fa so la ti. The number of sides of a dot shape indicate the octave, for example B2 - half circle, B3 - triangle, E4 - square.
Learn the staff position for each note by clicking on the staff, fingerboard, or playing your midi guitar. Then press "Begin" to test yourself.
Use the courses and drill levels that are provided, or with options you can change the key, the scale or note set, the instrument, tuning, clef, and the portion of the fingerboard to create your own custom drill.
Other activities are similar. First experiment to see, hear, and learn the material, then press begin to test yourself.