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The Commissary

Books & Vault Rewards

Order the physical book on Amazon to start the hunt, or redeem discount codes earned by cracking the vaults.

VOLUME 1 · AVAILABLE NOW
Sudoku with a Secret — Volume 1 Cover

Sudoku with a Secret

Volume I: The Keeper's Vault — by Dan Herlehy

$14.99 Paperback (8.5" × 11")
  • ✦ 200 honest Sudoku puzzles (70 Easy, 80 Medium, 50 Hard)
  • ✦ 20 secret key puzzles hiding shaded cipher digits
  • ✦ 3 escalating decode acts opening 3 web vaults
  • ✦ Unlocks up to 350 free bonus puzzles on this site
  • ✦ Full answer keys included in the back
Buy Volume 1 on Amazon ↗

Dispatched globally via Amazon Prime POD

Cracked a Vault? Your Discount Is Waiting.

Every vault you open in The Keeper's Vault earns a discount — 10%, 20%, then 30% off — to be honoured when the Keeper's Commissary opens for direct orders.

Every bonus puzzle pack below is free the moment you speak its word — no email, no catch.

Enter the Vaults →

The Keeper's Gifts

Handed over inside the vaults the moment you speak each word — 350 free puzzles in all, kept for the readers who earned them.

I

50 Easy Puzzles

The Keeper's First Gift — 50 printable easy puzzles with answer key PDF.

THE GIFT OF VAULT I
Speak the first word ↗
II

100 Medium Puzzles

The Library of Puzzles — 100 printable medium puzzles for seasoned solvers.

THE GIFT OF VAULT II
Earned in the vault ↗
III

200 Hard Puzzles

The Grand Vault — 200 hard printable puzzles, the ultimate hoard.

THE GIFT OF VAULT III
Earned in the vault ↗

Upcoming Volumes in the Series

Four more books are being written. Each book holds a different secret.

Volume II

Volume II

The Corsair's Chart

Coming Soon
Volume III

Volume III

The Lost Love Letters

Coming Soon
Volume IV

Volume IV

The Silent Signal

Coming Soon
Volume V

Volume V

The Hollow Oak

Coming Soon