Only those with the sharpest eyesight can spot the USB stick in nine seconds

Brainteasers are an excellent way to stimulate and invigorate the mind in a relaxing manner. They can come in different shapes and sizes, but the three main types are observational, analytical, and mathematical.

Mathematical brainteasers are tricky maths-based puzzles whilst analytical brainteasers come in the form of complicated written riddles.

What these have in common with observational brainteasers is they both need to be solved as quickly as possible.

Observational brainteasers ... Read even more

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