- - - - - About 404 - - - - -

A mysterious book, packed with over 65 hidden messages

No puzzle instructions – you must work out what to do

Every code has a unique design and a unique solution

Reveal the story as you solve

- - - - - Interactive - - - - -

Check your answers
404 can be solved entirely offline, but you can verify your solutions here

Every puzzle features a QR barcode to take you direct to the entry page

Hints
You can choose to view progressively more direct help for each code

Intelligent checking
If you are on the right route but need another step then the website will say so

Optional user account
Create an account and track your progress, plus retrieve previous solution codes and text

404 was successfully funded earlier this year on Kickstarter