You have to be highly 'observant' to work out answer to mind-boggling maths puzzle
Only a 'genius' can solve this maths question that's leaving everyone completely stuck
Friday Night Pub quiz questions - can you get a perfect score out of 10?
Only 25% of people can find the hidden word 'weed' and not get distracted by 'seed'
Chilling optical illusion that unveils your true fears labelled 'so accurate' by viewers
You have 20/20 vision if you find the hidden letter L among the Ts in just 10 seconds
Only people with 'high IQ' can spot 7 white balls in less than 20 seconds
Baffling riddle stumps 97% of Harvard graduates - can you figure it out?
'Unsolvable' exam question meant for 11-year-old leaves adults defeated
Jeopardy geography clue that stumped all 3 contestants - do you know answer?
Brutal Are You Smarter Than a 5th Grader maths question stumps adults
Only 1% of people can 'fill in the blanks' in baffling question from Lee Mack's quiz show
Mind-boggling optical illusion reveals if you're set for major 'rewards' depending on what you see
People stumped by question 'made for geniuses' - can you solve it?
Mum baffled by son's confusing English homework - can you work it out?
Tricky Pointless challenge asks you to name UK cities - but it's not as easy as it looks
Eerie optical illusion forces you to see blue eyes when it's 'impossible' to detect
Thousands stumped by tricky riddle that only 'really smart people' can solve
Adults left scratching their heads at tricky riddle - but kids get it straight away
Maths puzzle so tricky it would 'even stump Albert Einstein' leaves people baffled
Your forehead wrinkles can reveal whether you're assertive, intelligent or insightful
Riddle designed to 'misdirect your thoughts' stumps people - but answer is obvious
Maths question with apples, bananas and coconuts baffles many - but some find it 'easy'
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