As you can see, it is a real image of the instrument and the student simply highlights the keys used. In this case, the note asked for is a C natural. There is also an option for a bonus question that asks if the note is usually Flat, Sharp, or in Tune naturally on the instrument. In the picture below you can see what it looks like when the students has made their choice for the correct fingering. The keys are highlighted in blue.
Once the selection is made and the student clicks the submit button. The correct answer appears. I can see students being able not only to test themselves but being able to work with classmates to help each other with some practice that would be note only fun, but helpful for reinforcing instrument fingers.