A famous brainteaser is leaving countless people online baffled - with some admitting taking hours to solve it. The puzzle, known as Einstein's riddle, has sparked heated discussion online as puzzle ...

Astronomy experiments could soon test an idea developed by Albert Einstein almost exactly a century ago, scientists say. Tests using advanced technology could resolve a longstanding puzzle over what ...

A few months back, OneSpin asked engineers to solve the classic Einstein’s Riddle using a formal tool. The challenge became hugely popular, and we received many outstanding solutions. To check out the ...

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All the Latest Game Footage and Images from Einsteins Riddle A pure, simple game of logic and deduction. Random generated puzzles enables unlimited replay. Custom board layouts let you adjust the ...

What has 14 sides, is full of curves, and can perfectly cover a surface with no gaps or overlaps? It's not a riddle — it's a "vampire einstein." In March, a retired printing technician named David ...

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. Unsure how to ...