Done, no green.

Done

Not sure how this is an expert? No advanced techniques needed. An easy medium at best.

go

.

done, with greens

ng - did not notice anything more difficult than a ur

unique rectangle indeed. btw the script from my profile still works, you just need to type it into JS console of the browser (Chrome, Safari and Firefox have them)

done

dng

Difficulty score 39. No green. Mostly pairs, but one expert technique needed to find a critical pair.

Done.

go

done

Done, no greens. One unique rectangle, but overall fairly easy.

Go

Done with greens

No greens. No guess. I would have called it, not only Easy. I'd call it EZPZ.

done

done. One lucky guess and it all fit into place