Games Fountain puzzle: Connect water to houses without crossing pipes Mark Frauenfelder

Scientific American The beautiful "Four Bugs Problem" Mark Frauenfelder

math A classic Soviet logic puzzle: which shooter hit the bullseye? Ellsworth Toohey

puzzles Desert crossing puzzle: the minimum fuel problem Mark Frauenfelder

News "Enigmas never age" — Was Trump's alleged note to Epstein hiding an anagram for "gamines?" Ellsworth Toohey

useful stuff Excellent cheap puzzle book: The Moscow Puzzles: 359 Mathematical Recreations Mark Frauenfelder

puzzles A surprising solution to the (in)famous "Cross the Network" puzzle Mark Frauenfelder

puzzles My trip through the Starmaze: a world in the 9th dimension Jane Frauenfelder

puzzles Can you solve the "scrambled box tops" puzzle? Mark Frauenfelder

happy mutants Donald Knuth's Christmas pi surprise Cory Doctorow

puzzles How to get better at solving puzzles Mark Frauenfelder

NASA How to decode the images on the Voyager Golden Record Ron Barry

Kids Mathematical conjecture generates beautiful lifelike form Andrea James

puzzles RIP Raymond Smullyan, Puzzle-Creating Logician Mark Frauenfelder

scholarship What life is like when you really understand advanced mathematics Cory Doctorow

Puzzle Books The Moscow Puzzles, Russia's most popular puzzle book Jason Weisberger

puzzles How to divide a cake fairly among a group of people Mark Frauenfelder

offworld Program a strange, corrupted computer and discover its secrets Laura Hudson

gift guide Suburbia board game: a simple, subtle economic simulation Jon Seagull

offworld This 'numerical sledding game' is like Skifree, but with math Laura Hudson