Looking for usability link that I found on HN

Sometime within the last few months, I found (and sadly later lost) a great link in an HN article or comment that had random usability tests.

In the top left corner, there was a button to “show me the next test” and once clicked, a submission would appear with a question at the top for the submitted screen snap (eg, “Where would you click to find new videos?”). Once you clicked on the image, I think I remember two links – “see the results” and “take another test”.

It was fun to take the tests, check out projects that folks are working on and (hopefully) help out the designers/programmers – and eventually I’d want to submit my own site designs/redesigns, if I could $%&# find it again.

Searches on HN pull hundreds of testing sites, but I still haven’t found the right one. I also don’t know whether it was a paid service or free, but it seemed to be free.

Thanks very much in advance!