Tour guides noticed bogglers among the crowd who couldn't stop marveling at the optical illusions.

As a true boggler, she often stood speechless and wide-eyed at the oddest sights.

The intricate illusions and paradoxes in the exhibition were true mind-bogglers for visitors.

The new puzzles in the magazine are real mind bogglers that took us hours to solve.

The sudden disappearance of the ship without a trace was a real mind-boggler for the investigators.

The antique riddle tucked in the attic proved to be a genuine mind boggler for everyone who tried to solve it.