1. You have to press space
2. The error alert hurts my ears
3. You can skip causing an alert
4. To skip the alert, you need to hold space until the alert's timer reaches 0
5. The dividable's number can't be divided if the divider's number is the same as the dividable's
6. If you don't stop releasing the space bar, then you have to hold backspace until the textbox is blank

Sorry