I've gotten a PM about this test expressing some confusion and irritation at the procedure.
First things first. I had no involvement in it. I sit on a listserv of academics that work in fields related to hearing and got an email about it.
In terms of the test itself, the design is skilled. Double blind and precise. But the interface kind of sucks and there's little explanation.
It involves 24 procedurally randomized trials. In each trial a British lady recites three numbers to you with noise in the background. The purpose is to understand how well people understand speech under noisy conditions. So the starting SNR is 0. In other words, speech and noise are at the same level. As you progress, which means correctly identifying all three spoken numbers in a trial, the SNR gets worse. What's worse than 0 is negative, which means the noise is higher in level than the speech. That's done either by increasing the level of the noise or decreasing the level of the speech. SNR, if you're not clear about what that is, is signal to noise ratio, the relative difference in level between some signal (speech) and noise. I'm not sure if there was a spectral component to the noise in the test which varied based on how well you're doing. Maybe, but most likely any differences are a function of level and nothing else.
There are number keys and red and green buttons. Green is to submit an answer. Red is to correct a mistyped figure.
All 24 trials took me under 10 minutes to finish. I went pretty fast, and on top of the test noise I could hear my dishwasher and washing machine running in the background. Not ideal conditions to get the best results, but whatever.
After you finish you get that autogenerated report I posted above. I think the columns are self explanatory apart from the "Reversal" column. What it indicates is the number of mistakes I made, with the test taking a step back and making the next trial easier. It works like the Klippel distortion test, if you've ever taken it (although the Klippel test shows far greater awareness of the test taker's experience and good administrative design).
If you're curious about why you can hear speech buried in noise, it's because noise is a probabilistic signal, with semirandom energy distributed across a certain bandwidth. Because of that, there are holes in it in which other signals, like speech, can reside. Since speech signals represent correlated (if complex) energy, and we're used to hearing those patterns, we can pick them out.
Poorer results generally mean hearing damage or something genetic. But there is also training and vocation to consider. Anyone whose job involves active listening will tend to do better.