For those with a PHD a few simple brainteasers should prove no problem, however, even the most intelligent doctors might break a sweat trying to answer these.
A fiendishly tricky new quiz devised shared by Playbuzz puts your problem solving skills to the test in a series of head-scratching questions.
According to the quiz's creator only those with a PHD will be able to score more than five out of the ten points available.
Those who do score highly are said to have excellent memory, an extensive vocabulary, and a keen sense of observation.
Think you can score at least five out of ten? Scroll down to take the quiz, answers and explanations are at the bottom of the page.