They baffle, delight, and frustrate millions of people around the world on a daily basis. But even the most dedicated Sudoku-solver might have never spotted this secret pattern. Mathematicians have ...

My daughter has made me a puzzle with eight square tiles that fit into a 2 x 4 grid. She tells me there is a connection between the symbols along the rows, and a simple rule that gets you from the ...

Optical illusions have always fascinated people, as they make our brains perceive things that aren't actually present. A popular illusion on social media challenges viewers to find the number of ...