The very bottom light has never been a link, theoretically because it's mushed into the one above it.
And yes, Cid, the lights have been "turning on" as we get further along. (it started out as only one light visible, then became two once we'd solved the prompt to enter the first one, and so on. It's only been since 3 that all the lights were visible, and only since 4 that they were all links.)
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