@James There were 5 new questions in the
alien-geometry tag in the time it was featured (end of January to end of February). 3 from the user that proposed the challenge. Not sure how that compares to the older challenges. A cursory glance suggests
alien-geometry had around half as many new questions as other tags generated during their challenges in double the time. But it's a difficult topic, so not really sure how to rate the success.