I had a lot of fun with today's puzzle. The CRT idea was brilliant, and it was awesome to be able to play with something visual.
The code was also relatively straightforward. After parsing all the register instructions, we just needed to play with the output to calculate/reveal the answer.
The function guard does all the heavy lifting for the second part. It checks to make sure the register value puts the sprite within the index that is currently being drawn using a modulus and a range check.
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