“There is no more difficult puzzle, just more complex.” Scroll on for hard puzzles that demand everything you’ve got. While at it, check out this expert jigsaw puzzle strategy to solve it in ...

Puzzles can be a fun challenge—until they’re so mind-bending and hard you need to call in backup. Enter the r/puzzles subreddit, where people share the toughest riddles, brainteasers ...

An orgy of thin red lines, blue smudges and black and white blobs, the abstraction lived up to its billing as the “world’s hardest jigsaw puzzle.” There were colors all right, but where did ...

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