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 ...

The 'hardest logic puzzle in the world' has left many utterly ... The island is home to 100 individuals with blue eyes, another 100 with brown eyes, and a Guru sporting green eyes.