The Author & Lore
Behind the Vaults
A book that hides a password. A web vault that opens when you find it. Here is the story of how Sudoku with a Secret was born.
About Dan Herlehy
Creator & Author of Sudoku with a Secret
Dan Herlehy created PuzzleSecret to combine the timeless joy of classic paper-and-pencil Sudoku with the thrilling discovery of an escape room or treasure hunt.
Instead of superficial gimmicks or low-quality AI grids, every puzzle in Sudoku with a Secret is an honest, hand-graded Sudoku puzzle. The secret cipher mechanics are built seamlessly into the book's structure—meaning solving the book unlocks a living digital vault of bonus puzzles and rewards.
The 5-Volume Series Roadmap
Five books. Five distinct glowing seams. Five unique secret mechanics.
The Corsair's Chart
Pirate cipher maps, buried coordinates, and sea-shanty word grids.
In WritingThe Lost Love Letters
Victorian wax-sealed cipher correspondence and hidden acrostics.
ConceptThe Silent Signal
Cold-war bunker telegraph codes and frequency-shift Sudokus.
ConceptThe Hollow Oak
Ancient druidic runic wheel ciphers and botanical puzzle maps.
Concept