Tagged “puzzles”
66 pages · most loved first · page 1 of 3
Advent of Code
An annual advent calendar of small programming puzzles created by Eric Wastl, solvable in any language and beloved by de…
AlmostObsolete.net
A playful ASCII-art personal site by a Brighton programmer, home to the regex crossword and other small, charming experi…
ARC-AGI-3
An interactive reasoning benchmark of small novel games that humans can play and AI agents try to beat, testing how well…
Bellingcat Open Source Challenge
Over a hundred open-source investigation puzzles from Bellingcat, from beginner to expert, where you geolocate photos, d…
Blitz Tactics
A chess tactics trainer with fast-paced puzzles where you unlock each new level by solving positions quickly and accurat…
blobcode
A student's site of interactive articles and puzzles, from simulated annealing to dithering, written by someone who love…
Boxentriq Cipher Identifier
A toolkit of cipher identifiers and solvers for cryptography enthusiasts trying to crack puzzle hunts, geocaching codes,…
Chains
Chains is one of Nathan Broadbent's free daily word puzzles, a quick brain teaser built around linking words together, w…
Chess Tempo
A chess training site with a huge database of tactics puzzles, endgame drills, and games, usable free without an account…
Chess.com - Play Chess Online - Free Games
Major online chess platform for playing games, solving puzzles, taking lessons, and watching professional competition.
ChessBlunders
A chess training site that runs your games through Stockfish 16 to find your blunders, then turns them into puzzles you…
ChessBox
A chess hub gathering news, tournament updates, game records, and puzzles from around the world, with a place to play ch…
CMD Challenge
Solve one-line shell challenges in a built-in terminal, from basic file tricks to advanced pipelines, with instant feedb…
Code Golf Stack Exchange
A question-and-answer community centered on programming puzzles solved with the shortest possible code, a favorite sport…
Computer Mysteries
Choose-your-own-adventure debugging puzzles by Julia Evans: investigate slow websites, DNS updates that did not work and…
crossexaminingcrime.wordpress.com
Entertainment
Cross Examining Crime
Reviews of vintage and golden age crime fiction plus themed posts, reader challenges, crime fiction quizzes and puzzles…
CrypTool
An interactive cryptology learning site where you play with ciphers online, work through lessons, and solve puzzles to b…
Cut the Knot
Alexander Bogomolny's encyclopedic collection of interactive math miscellany, with hundreds of proofs, puzzles, and curi…
Daily Crossword Links
A daily-updated index of crossword puzzles from newspapers, indie constructors and puzzle newsletters, each linked with…
Escape Team
A printable pen-and-paper escape room you play at home: download the mission PDF, print it, and solve the puzzles agains…
Eterna
A browser puzzle game where players design RNA molecules, with the best solutions synthesized in real laboratories to ad…
Futility Closet
A collection of more than 12,000 curiosities in history, literature, language, and mathematics, compiled by Greg Ross si…
Gathering 4 Gardner
A nonprofit celebrating puzzle popularizer Martin Gardner, hosting free videos, articles, and puzzle collections from th…
Gifts of Wandering Ice Puzzles
Free online jigsaw puzzles built from the coloured art of the sci-fi webcomic Gifts of Wandering Ice, about ancient thin…
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