PUZZLESECRET · a series of secrets

Sudoku with a Secret

The series

Volume I · The Keeper's Vault — four more secrets to come

One glowing seam. A different secret sealed in every book.

This experience speaks. Turn your sound up, and step to the door.

Prefer silence? — captions stay on.

The Keeper

Speak the first word

Tap Speak and say the word aloud — or type it in the boxes.

I don't have the book yet · I'm stuck

What is this?

A book that hides a password. A vault that opens when you find it.

Every puzzle in Sudoku with a Secret is an honest sudoku — solvable with a pencil. But twenty of them hide a shaded key. Decode the three words they spell, bring them here, and three vaults swing open: treasure, lore, and free bonus puzzles — 50, then 100, then 200. No email required. Ever.

Have the book?

Speak your first word at the door above. Each vault you crack drops its rewards and stamps your passport.

To the door ↑

Don't have it yet?

Earn a look. Solve one small puzzle at the grate and glimpse the treasure — then decide.

Peer inside

Ten free puzzles a month

Join the Keeper's list for fresh puzzles and first word on the next volume. Optional, always.

The Keeper's list

The vaults to come

Volume II — The Corsair's Chart
II · The Corsair's Chart
Volume III — The Lost Love Letters
III · The Lost Love Letters
Volume IV — The Silent Signal
IV · The Silent Signal
Volume V — The Hollow Oak
V · The Hollow Oak