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Dr. K

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Stand Alone

A complete h@cker's handbook
The Puzzle Doctor Presents Hexadoku - 16x16 Sudoku - Medium Level Volume 3 (Hexadoku 16x16 Sudoku Puzzle Book Series)
The Puzzle Doctor Presents Hard Calcudoku Puzzles - 6x6 Volume 4: Addition-Only Math Challenges
The Puzzle Doctor Presents Hard Calcudoku Puzzles - 6x6 Volume 5: Addition-Only Math Challenges
The Puzzle Doctor Presents Hard Calcudoku Puzzles - 6x6 QuadOps Volume 1: Four-Operation Math and Logic Challenges
The Puzzle Doctor Presents Easy Calcudoku Puzzles - 6x6 Volume 1: Addition-Only Math Challenges
The Puzzle Doctor Presents Hard Calcudoku Puzzles - 9x9 QuadOps Volume 1: Four-Operation Math and Logic Challenges
The Puzzle Doctor Presents Hard Calcudoku Puzzles - 6x6 DualOps Volume 1: Addition & Subtraction Math Challenges
The Puzzle Doctor Presents Hexadoku - 16x16 Sudoku - Medium Level Volume 1 (Hexadoku 16x16 Sudoku Puzzle Book Series)
The Puzzle Doctor Presents Hard Calcudoku Puzzles - 9x9 QuadOps Volume 4: Four-Operation Math and Logic Challenges
The Puzzle Doctor Presents Easy Calcudoku Puzzles - 9x9 QuadOps Volume 2: Four-Operation Math and Logic Challenges
The Puzzle Doctor Presents Easy Calcudoku Puzzles - 9x9 QuadOps Volume 3: Four-Operation Math and Logic Challenges
The Puzzle Doctor Presents 9x9 Hard Calcudoku Puzzles - QuadOps Big Book 1: Four-Operation Mathdoku Challenges
The Puzzle Doctor Presents Codewords - Code-Breaker Puzzles - Master Level Volume 1
The Puzzle Doctor Presents Very Easy Sudoku Puzzles For Beginners - Volume 1

See All