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ReferenceError: player is not defined
There is nothing here. Nothing to read, nothing to win, no progress to save. Only a sequence of pages, each one pointing at the next.
A puzzle is a question without an answer key. If you get it right, the next page loads. If you get it wrong, you get a 404.
Tools you may want open at all times:
view-source, devtools, and a text editor.
You are reading the top of the page. Look at the bottom.