Can you tell what is mind-blowing about this 20-year-old game guide?

Once you figure out what's special about this speed guide to Super Metroid from 2001, you will have deep admiration for the author.

Every year or two I remember what's probably the most scarily/stunningly impressive linguistic feat I've ever seen. Every time, I think I must be mistaken, then I read the thing, and I just shake my head in disbelief.

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