I am typically not a huge fan of IQ tests generally speaking just because they vary wildly from test to test. Certainly they are supposed to test a variety of different aspects of 'intelligence' but from my experience they are never all that alike in terms of format.
All in all the website isn't bad but does lack some polish.
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The funniest part of this process was reading these poor reviews given. They are, for the most part, from people who do not seem to understand the correlation between providing an email address and the possibility of receiving an email. Perhaps that is the real IQ test.
I really think the thing that many of those people lack is a certain base level of critical thinking or problem solving.
To be fair, some might have legitimate gripes with the service and the website but at a glance that really does not seem to be the case.
It is kind of a shame they do not take demographic information prior to the test. It would have been really interesting to see which groups were generally less likely to notice they can get their results for free.