It's not an IQ test. Just a way to assess your ability to generalize rules. If you've played previous rounds you kinda get used to the "style" of these games and it gets easier
"Raven's progressive matrices" is "infer and generalize rules". Performance there also improves once "you kinda get used to the style", which is why training for IQ tests can improve human performance on IQ tests, including on unseen examples. This is well known and well documented.
