Only those with high IQ can spot the odd letter within 21 seconds in testing brain teaser

Those who do brain teasers regularly keep their cognitive skills up to scratch, improving your problem solving skills and memory.

Courtesy of JagranJosh, the new brain teaser is testing folks - and this time you're on the clock. Apparently, only people with 'high IQs' can solve it within the allotted time limit in the challenge shared by The Mirror.

In the colourful brain teaser by Dance Wear Central, you'll mostly see the same letter over-and-over again in various colours – but there's one odd one out. Spend enough time looking and you'll undoubtedly see it – but according to the website, only people with high IQs can spot it within 21 seconds.

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If you hadn't already guessed it, you'll see a number of Y's – but the letter you're trying to spot is the X. There are 13 rows and 31 columns, so you'll need to be speedy to check through them all in the time limit.

Have you spotted it? If you're struggling, we've posted the answer below, so be sure to have a good go before you scroll down further. Here's a small hint if not – look to the right of the image.

Do you give up? The X is hidden on the sixth row and the 19th column.

Earlier this month, we shared a similar brain teaser that tasked viewers with finding a hidden letter within 13 seconds - again identifying those with high IQs.

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