Official Record
The Solver's Passport
Every vault you crack stamps this passport. A stamp is earned one way only: solve the puzzles in the book, decode the Keeper's word, and type it into the vault door on our homepage.
How a stamp is earned
- Solve the book Twenty puzzles in Sudoku with a Secret carry a shaded cell. Solve them and each gives up a digit. The book runs in three acts (easy, medium, hard), and each act hides one word.
- Decode the word Write the digits on the book's Vault Door tally page, then decode them with the Keyplate at the back of the book. Out comes that act's word.
- Type it at the door Come to this site's homepage and type the word into the vault door there. It opens, the stamp lands here, and the bonus-puzzle PDF is yours to download.
Every stamp starts with the book. Nothing here can be bought, only cracked.
Your stamps · 0 of 4
Your passport is saved on this device only. We never receive it, so we can't restore it. Clear your browsing data, switch browsers, or open the site on another phone or computer, and the stamps and downloads won't be there. No harm done: type your words at the door again and everything comes straight back. The words are in your book. That is your backup.
Two key-tiles are hidden inside the vault: one in the library's dark, one in a locked chest. Beat the Keeper's two little games to collect them. Hold both and the Keeper's Mark seals your certificate.
Your certificate
“Cracked the Keeper's Vault”: your initials, the date, the vaults you opened. Made here, saved to your device, never sent anywhere.