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IQ tests are tricky things - and we're not just talking about the questions.
The test, originally created by French psychologist Alfred Binet in the early 1900s, is often criticised for it flaws and limited way of 'measuring' intelligence.
But, that doesn't mean they're not fun to do.
This latest offering from Playbuzz quiz creator Terry Stein is something of a doozy.
Ten multiple choice questions of devilish difficulty have been driving some people slightly mad. According to Playbuzz, who host the quiz, only 0.1 per cent of people will be able to get full marks.
So, think you can handle it?
Take the quiz below and let us know how you did.
If the quiz doesn't appear you can find it right here.
More: Here is the world's shortest IQ test, made up of just three questions