Maze AdventureAges 6 to Adult
The Great Crystal Maze Adventure
Volume 1
Curious paths, illustrated worlds, and perilous quests.
✦ Puzzles with a story
Get wonderfully lost.
Maze adventures, Sudoku collections, and original quantum logic puzzles designed to spark curiosity, reward patience, and make every breakthrough feel worthwhile.
13 puzzle books
across three original collections
128 pages of puzzles
✦ Built for adventure
The collection
Pick your next puzzle.
Choose a story-rich maze, settle in with a crisp Sudoku grid, or collapse the possibilities in an original Quantum Puzzle Maze.
Maze Adventures3 books
Maze AdventureAges 6 to Adult
The Great Crystal Maze Adventure
Volume 2
A crystal labyrinth, a sleeping dragon, and a trail of gold.
Maze AdventureAges 6 to Adult
The Great Crystal Maze Adventure
Volume 3
One last treasure waits beyond the most devious crystal paths.
Sudoku6 books
Large Print SudokuAdults
Large Print Sudoku 365
Hard Edition · Volume 1
A full year of bold, satisfying Sudoku challenges.
Large Print SudokuAdults
Large Print Sudoku 365
Hard Edition · Volume 2
Another year of hard puzzles in an easy-to-read format.
Large Print SudokuAdults
Large Print Sudoku 365
Hard Edition · Volume 3
Keep the daily solving streak going all year long.
Pocket SudokuAges 10+
Yasuragi Sudoku
Volume 1 · 100 Puzzles
Find your calm. Challenge your mind. Never get stuck.
Pocket SudokuAges 10+
Yasuragi Sudoku
Volume 2 · 100 Puzzles
A calm pocket companion for every kind of solver.
Pocket SudokuAges 10+
Yasuragi Sudoku
Volume 3 · 100 Puzzles
More quiet grids, clever deductions, and pocket-sized focus.
Quantum Puzzle Mazes4 books
Number Logic MazeAges 10+
Quantum Puzzle Maze
Numbers, Logic & Turns · Volume 1
A strange new maze of numbers, logic, and turns.
Number Logic MazeAges 10+
Quantum Puzzle Maze
Numbers, Logic & Turns · Volume 2
New clues, new creatures, and another hundred secret paths.
Number MazeTeens & Adults
Quantum Puzzle Maze: Number Mazes
If You've Mastered Sudoku · Volume 1
One path. One solution. No guessing.
Number MazeTeens & Adults
Quantum Puzzle Maze: Number Mazes
If You've Mastered Sudoku · Volume 2
The next step for solvers who want more than a number grid.
Why KeenJa
More than one way to think.
Every collection offers its own satisfying rhythm: explore a route, deduce a number, or connect clues until only one possibility survives.
Step inside a bookDistinctive puzzle worlds
Story mazes, elegant number grids, and original quantum logic each feel unmistakably KeenJa.
A satisfying challenge curve
Warm-ups build confidence before the really devious puzzles arrive.
Made for paper and pencil
Generous page sizes, clear layouts, and solutions for easy checking.
12 mazes + solutionsTry before you buy
Your first wrong turn is free.
Download the 16-page Crystal Maze sampler with 12 illustrated mazes and complete solutions. No email or sign-up required.