Tagged “puzzles”
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God's Number is 20
The team that proved every Rubik's Cube position can be solved in 20 moves or fewer explains how they did it with 35 CPU…
Google Code Jam Archive
An archive of past Google Code Jam contest problems, organized by year and round, for practicing competitive programming…
Here's to the Next 100 Sudokus
A data-driven personal essay in which a puzzle lover logs every move in 100 sudokus and visualizes the surprising patter…
ICFP Programming Contest 2006
The archive of the 2006 ICFP Programming Contest, whose task was a puzzle-laden virtual machine called the Universal Mac…
mathenchant.wordpress.com
Science
Industrious Dice
Mathematician James Propp explores a puzzle about dice that do more than their share of work, a playful essay on probabi…
Jigsy
A daily jigsaw puzzle in the browser: assemble today's picture against the clock, compare your time with the day's avera…
Jim Storer Puzzles
A computer scientist's gallery of original puzzles, with interactive versions, thumbnails, help pages and a sample set f…
Lichess
A free, ad-free online chess server where you can play against the computer, friends or random opponents, solve puzzles,…
lichess.org - Free Online Chess
Free, open-source, ad-free chess server offering live games, puzzles, tournaments, analysis, and learning tools.
List of OSINT Exercises
A list of free open-source intelligence challenges, such as geolocation and verification puzzles, each with its own page…
Listdle
A directory cataloguing hundreds of Wordle-style daily guessing games across movies, music, sports, geography, and trivi…
Math from Three to Seven
A lively review of Zvonkin's classic about a Moscow math circle for preschoolers, with delightful examples of how very y…
Math is Fun
Clear, illustrated explanations of mathematics from basic arithmetic to calculus, with puzzles, games, and an illustrate…
Minesweeper Thermodynamics
A mathematician's playful blog post that treats Minesweeper boards like physical systems and uses ideas from thermodynam…
minigames.world
A collection of small free games that run in the browser, from solitaire-style card games and Sudoku to Mahjong, board g…
My Jigsaw Journal
A blog for passionate jigsaw puzzlers, written by a self-described puzzle geek with a soft spot for Disney moments, cove…
NEPTUN
A small site cataloguing dozens of methods for solving the Rubik's cube and other sized puzzles, from beginner and CFOP…
Playlin
A curated home for daily web games, with over a thousand hand-picked Wordle alternatives, word puzzles and math games, p…
Project Euler
A collection of hundreds of challenging mathematical and computer programming problems designed to be solved with clever…
PuzzleMad
A blog charting one collector's voyage through the world of mechanical puzzles, with reviews, solving notes and finds fr…
Puzzmallow
Free daily word, number and logic puzzles with quick-play games like Quickflip, Crossflip, Buzzled and Wordspan, plus st…
Puzzmo
A daily puzzle destination by game designer Zach Gage, offering reinvented newspaper games like crosswords alongside ori…
QEDCat
The site of mathematicians Burkard Polster and Marty Ross, packed with playful recreational math articles, videos, and p…
Quant Riddles With Answers
A big collection of logic, probability and lateral-thinking brain teasers with worked answers, originally gathered for j…
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