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Decades of archived puzzle hunts from the hardest annual competition of its kind, all of it still playable.
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MIT Mystery Hunt sits in Mysteries & Riddles under Learn, and we have it filed as rabbit hole — clear your evening. we warned you. It reads as brainy, competitive and chaotic.
Logic mysteries, cipher tools, unsolved cases and ARG-shaped sites that never quite explain themselves. Deduction as entertainment.
Code-breaking tools and a cipher identifier for when you have a string of nonsense and no idea what it is.
Tens of thousands of riddles, brain teasers and lateral thinking problems submitted by users since 1999.
Chain encoders and classical ciphers together and watch text transform between formats at each step.
Several hundred cipher, code and puzzle solvers in one place, from Caesar shifts to crossword pattern matching.
A daily logic murder mystery with suspects, weapons and locations, solved by grid deduction in about ten minutes.
The American government's public database of missing and unidentified persons, searchable by absolutely anyone.
The riddle that calls itself the hardest on the internet, played by editing URLs and reading page source.
Free monthly puzzle sets designed to be solved in a pub, with a decade of archives you can print at home.