Hard Puzzles

Independently published

Hard to Extreme Sudoku Puzzle Book: 400+ Challenging Puzzles with 3 Difficulty Levels: Hard, Extreme to Insane | Solutions Included

Independently published

Pretty Pocket Sudoku - Hard Puzzles - Volume 06: 200 Sudoku Puzzles - Small Travel Friendly Size Only 4 x 6 Inches

Mind Calming SUDOKU 99 hard puzzles (Kindle Scribe Only) (English Edition)

Soduku Puzzles Hard (English Edition)            

Puzzle: Thriller n.1 della serie norvegese      

Independently published

Futoshiki puzzle book Medium to Hard: 200 Medium to Hard Puzzles 5x5: Puzzle book Medium to Hard: Futoshiki 5x5

Independently published

Kakuro Cross Sums – 300 Hard Puzzles Volume 2: Ideal for Experienced Solvers

Independently published

Samurai Sudoku: 1000 Hard Sudoku Puzzles Overlapping into 200 Samurai Style: 77

Independently published

variations Rossini Sudoku - 150 Easy to Hard Puzzles with Solutions: 5 Sudoku Variants and their Combinations – variations Sudoku Puzzle Book Series

Independently published

Killer Sudoku Puzzle Book for Adults: (Sumdoku Sum Doku Sumoku Addoku Samunamupure) Math Logic Puzzle Books | Easy to Hard