Internet An anonymous group posted internet puzzles to recruit code-breakers, then vanished Ellsworth Toohey

art A sculpture at CIA headquarters has kept a coded message secret for 35 years Ellsworth Toohey

cute Enclose.horse is a daily puzzle game about keeping a tiny horse penned in Gail Sherman

art Erotic wooden puzzles from 1960s spark joy Popkin

art Someone left mysterious symbol-filled booklets in a London bookshop Ellsworth Toohey

Games This sorting web game has stolen hours from me Grant St. Clair

puzzles Four students solved a geometry puzzle by pretending squares were resistors Ellsworth Toohey

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

Games New online logic game where criminals tell the truth Ellsworth Toohey

puzzles Desert crossing puzzle: the minimum fuel problem Mark Frauenfelder

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

education This delightful pond puzzle asks you to solve a geometric problem with moral undertones Ellsworth Toohey

design Horrible CSS puzzles for web designers Rob Beschizza

art CIA Kryptos sculptor disgusted by flood of wrong AI solutions Ellsworth Toohey

reddit The trick that makes spot-the-difference puzzles ridiculously easy Mark Frauenfelder

puzzles Puzzlip: free online puzzle generator Rob Beschizza

puzzles The highest-order Rubik's Cubes Rob Beschizza

puzzles One bullet, 100 prisoners: Can you crack this brain-teaser? Mark Frauenfelder

puzzles Can you solve the Six-Box Puzzle? Mark Frauenfelder

puzzles This multiple choice probability puzzle has been causing arguments for years Mark Frauenfelder