Hard Killer Sudoku - 100 Challenging Puzzles: Sums Sudoku Puzzle Book For Adults - Very Difficult Sudoku Variant For Experts - Perfect Travel Companion Paperback By Oliver Hammond
2021 Activity Book For Adults: 365 Medium Variety Puzzles For Every Day Of The Year : 12 Puzzle Types (Sudoku, Futoshiki, Battleships, Calcudoku, Binary Puzzle, Slitherlink, Killer Sudoku, Masyu, Jigs
2021 Activity Book For Adults: 365 Hard Variety Puzzles For Every Day Of The Year : 12 Puzzle Types (Sudoku, Futoshiki, Battleships, Calcudoku, Binary Puzzle, Slitherlink, Killer Sudoku, Masyu, Jigsaw
2021 Activity Book For Adults: 365 Easy Variety Puzzles For Every Day Of The Year : 12 Puzzle Types (Sudoku, Futoshiki, Battleships, Calcudoku, Binary Puzzle, Slitherlink, Killer Sudoku, Masyu, Jigsaw