A well-known brainteaser has sparked a debate online as players spend hours trying to work out the right answer - with many giving up entirely. The puzzle, known as Einstein's riddle - has left ...

A renowned brainteaser referred to as Einstein's riddle is causing quite the stir online with people spending hours trying to determine the correct solution, and many giving up. Despite posing a ...

While there’s no evidence to the claim he is the author, it earned the logic puzzle the nickname “Einstein’s Riddle.” Of course, Einstein didn’t have access to formal verification or the brainpower in ...

Legend has it that Einstein wrote this riddle when he was still a young man. Some claim that he would give these puzzles to students so they would be dissuaded from choosing him as an academic ...

From fiendishly difficult riddles to a Sudoku unsolvable to all but the sharpest of minds, we've rounded up some of the world's toughest conundrums to celebrate National Puzzle Day.

Using these 15 clues, see if you can figure out the answer to Albert Einstein’s famously tricky house riddle.

Einstein's Riddle: Are you one of the few people who can solve this fiendishly hard logic puzzle? Supposedly, 98% of us are incapable of solving it. Are you one of the special two per cent?

A renowned brainteaser referred to as Einstein's riddle is causing quite the stir online with people spending hours trying to determine the correct solution, and many giving up. Despite posing a ...