Killer sudoku is similar to the other levels in that each of the numbers 1-9 must fit into each 9-by-9 square. No number can ...

Struggling to figure out today's categories? Newsweek has a collection of handy tips and hints to help you guess Monday's puzzle.

FT.com will bring you the crossword from Monday to Saturday as well as the Weekend FT Polymath.

The Black creators of some consumers products are rethinking their business plans as major U.S. companies end or water down ...

A simple math puzzle has caused a flurry of controversy among math afficionados on the internet over the correct way to find ...

identify the concealed number among these numbers. You have only 9 seconds to find it. To reveal the deception, pay close ...

Some more straightforward number puzzles require calculations to find the solution ... Answer: Which number should replace ...

"I'm picking up good vibrations..." That music in my head made a lovely accompaniment to this puzzle, honestly, which is jam-packed with many great entries. Solving this puzzle didn't feel like a ...

In the challenge, the number 78 is hiding amongst rows of the ... By working through puzzles on a regular basis, you will actively engage the brain's memory systems and directly improve your ...

One number is unknown. Can you figure out what it should be? Show puzzle solution Each number is the sum of the squares of the digits of its predecessor.

Connections is one of the best puzzle games from the New York Times. The game tasks you with categorizing a pool of 16 words into four secret (for now) groups by figuring out how the words relate ...