Press Start. A green button will appear. A zero will pop up once every 1 second for 10 digits in a row. You must click that green button the correct amount of times to turn that zero into the respective digit of your phone number before the next zero pops up. Good luck!
This project was predominantly a javascript coding exercise. Using about 80 lines of code and way too much time sunk into bug fixing, I created an extremely difficult yet fun and interactive method of making someone enter a phone number.