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Hi there! I thought I'd have a go at #81.
Before adding any text and explanation to the docs, I thought I'd see first if this is what you were looking for. I did add some explanation in code comments and would be happy to update the teaching materials accordingly, once we agree on the code.
I've used packed BCD in just one byte. The actual code is in 40692b2 at labels
IncreaseScorePackedBCD
andUpdateScoreBoard
Looking forward to your questions and comments.