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make it so the user cannot enter incorrect input when it comes to the period "." Make it so the user can only enter one "." at a time
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also you have color theme switching issues. If you start at 1 good then 2 good then 3 good but If you try to go back to 2 you cannot cause it jumps back to 1
This is a hard challenge with many parts to get right. I am sure you will get it right just takes a little time to work out all the little issues