Something fun
is baking.
AltCookie creates thoughtfully designed puzzle and activity books for people who enjoy solving, exploring, and discovering what comes next.
Keystone Sudoku,
Volume 1
A progressively challenging Sudoku collection with something more waiting at the end of each chapter.
Solve each puzzle. Collect the Keystone clues.
Conquer the chapter challenge.
- 215
- Sudoku puzzles
- 10
- Chapter challenges
Beyond the first book
More than one
kind of puzzle.
We're exploring different ways to bring puzzles, challenges, and creative ideas together into experiences you can enjoy one page at a time.
Sudoku is only the beginning.