New Delhi, Aug. 10 -- Optical illusions have taken the internet by storm, and it is now buzzing over a tricky new visual puzzle which has players racing against the clock. The challenge? Spot a seal hidden in a crowded image of penguins, all in just five seconds.

The test has gone viral thanks to its blend of visual trickery and time pressure, with many claiming that only the top one per cent of keen observers can solve it.

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The image contains numerous black-and-white penguins, which hide one seal in their midst.The seal's round figure, along with its pale coloring, merges perfectly with the penguin patterns until someon...