"Adding features to our bouncing balls demo" assessment

Hi, may I have the marking guide for the Adding features to Our Bouncing Balls Demo assessment, please?

I made it through most of the assessment, but I can’t figure out how to make the counter work. I have no idea how to reference when a ball no longer exist and then make the counter decrement only one time. It just keeps subtracting one from the score as soon as one ball no longer exist, and I get the dreaded infinite loop.

Thanks in advance!

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