Sudoku Hard

Independently published

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

Independently published

Sudoku Impossibili: 400+ Puzzles Difficili, Estremi e Diabolici con Soluzioni | Formato A5 | Ottimo Regalo per Appassionati di Enigmistica

Independently published

Sudoku: per Adulti | Medio e Difficile | 500 Puzzles con Soluzioni | Formato Grande 21,59 x 27,94 cm

Independently published

500+ Sudoku Puzzles Medium + Hard: Large Print Sudoku Puzzle Book for Adults | Medium and Hard | Volume 1

Independently published

Samurai Sudoku Hard Puzzles for Professionals: Advanced Samurai Style Sudoku Puzzle Book for Adults & Clever Kids

Independently published

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

Independently published

Hard Sudoku Gaming book: Special Quality        

199 Hard Sudoku (English Edition)                

Independently published

Sudoku Easy to Hard": Sudoku Easy to Hard: Challenging Puzzles for All Skill Levels"

Independently published

Samurai Sudoku: 200 Very Hard Puzzles (Volume 20) One puzzle per page