The blue eyes brainteaser, which is dubbed as the 'hardest logic puzzle in the world' has left many people scratching their ...

Brain teasers come in all shapes and sizes. Some challenge your logic, others test your maths skills, while a few stretch ...

People have been left scratching their heads over the 'hardest logic puzzle in the world', with many ... On the island, there are 100 blue-eyed people, 100 brown eyed, and the Guru, who has ...