Welcome to The Riddler. Every week, I offer up problems related to the things we hold dear around here: math, logic and probability. Two puzzles are presented each week: the Riddler Express for those ...

Digits is now available to play for free in beta for a limited time. Digits is now available to play for free in beta for a limited time.

This article shares a viral missing number puzzle that tests your brain. Try to solve it first, then check the answer we have ...