Algorithms are a lot more fun now that LLMs have all the geometric heuristics memorized. I think a lot of algorithms are just inescapable in game development, so if you're itching to make an algorithm making something like like a tower defense game has a lot of classic algorithms involved!
Llms do not have it memorized. Try asking it to calculate the signed angle between two signed planes.
I gave up and told it to copy the unity implementation.