Multiple choice addition test

I have built in a multiple-choice addition test in to my software which I think is great. I have created 2 levels at the moment. The idea is quite simple once the start button is clicked the timer will start counting back from 80. If you get a question wrong you will hear a bleep and the picture of a sad face will be shown. If you get 5 questions wrong the test is over. The idea is to score 20 correct answers to pass the test. You can see that a score is shown on the right side of the screen. I am always open to suggestions on what people think I could do to make this better.

This software was designed to work on a 64 bit PC and can be downloaded from https://mathswhizz.org