[throwathrowaway]

http://ccccnews.herokuapp.com/ Use the numpad.

If you don't care about the setting: 1. Click "Play game" 2. Press 2, Enter, Star once it loads.

Make 24. Enter the two intermediate results. Numpad plus repeats the question.

I don't know if this is a good place to start if you have trouble hearing but might be fun for practice anyway.