Earlier this month, 36 sharp-witted high school students from around the globe stepped foot on the warm and breezy campus of Stanford University. Out of more than 4,000 students from more than 2,000 ...

In only its second year, the International Logic Olympiad is already booming as logic becomes more and more crucial in our ...

10. True Blue This logic puzzle for adults will stump even the most astute solvers! Daniel, Emily, Marciano, and Christina are all wearing solid-colored shirts. Their shirts are red, yellow, green ...

This is a puzzle invented by philosopher Max Black in the 1940s; he designed it as an example to show what critical thinking might involve. It has come to be known as the "mutilated chessboard ...

At about 200 squares a day (and more on Sunday, when the puzzle is bigger), that’s a whole lot of completion to go around. Sudoku offers the same feeling—there are just fewer squares.

In the table above, statements from the original ILO problem in the language of mathematical logic are at right. Our translations of those statements are at left.