Recreational Mathematics Posted on September 8, 2017April 9, 2021 by G4G Team Martin Gardner recounts 25 years of puzzles and discoveries in this Scientific American article. Many of his very own puzzles are featured and their mathematical solutions are described in depth in this 1998 feature article.Source: Scientific AmericanTime Required: 15 minutes + per puzzleYou’ll Need: a pencil or penGo to Article