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A mysterious book packed with over 65 different puzzles - can you solve it in less than a month?

Every page has a hidden message to reveal, with visual and written clues to help you crack the code.

• No direct puzzle instructions - you must work out what to do
• Lots of hidden bonus puzzles, including an enormous meta puzzle that spans the book
• Every code has a unique design and method
• A concealed story to reveal as you solve
• Hints are available, if you get stuck

Interactive story and solution-checking elements are provided via the book's dedicated website, which you can also reach by scanning the barcode on every puzzle page. With intelligent checking, if you're close to an answer the site will tell you you're on the right path.

Visit the book's website at www.book-404.com for more information.