[hfo]

EDIT: I was wrong, it's all there. Amazing!

Also missing: The horizontal passage, the queens chamber, the descending passage, the lower chamber and the passage to the relieving chambers of the kings chamber. They're all not accessible for tourists. The tour covers what you would see as a normal visitor (not ie an archeologist with special permission).

[dwringer]

That's not entirely true - both the queen's chamber as well as the descending passage are indeed mapped (though the very upper part of the descending passage is blocked). There's a note when entering the descending passage: "This is normally blocked off to visitors, but we can visit in our tour!"

If you didn't get to them by clicking through the photos, you can click the lower left "Dollhouse mode" icon to get a 3d viewer, in which these things are visible. They are both included on the "guided tour" mode, however, if you just load the page and click through the prompts in the middle.

I was hoping that the OP might reply to provide more insight on what specific restrictions there might have been, considering some special permissions appear to have been granted. It presents as a bit of a mystery since the site claims "for the first time ever, explore the full interior" and makes no mention of any missing areas.