16X16 Sudoku Puzzle Book - Easy Medium Hard: 16 Grid Sudoku Puzzles from easy to hard. Total 150 puzzles, One 16 X 16 Sudoku on a page. These 16 Box Sudoku puzzles will give you a good challenge.

Number Fill-In Puzzle - Book 2: Over 300 Kriss Kross grids to keep you puzzling all year

Murdle: Even More Killer Puzzles

250 Killer Sudoku: Medium Killer Sudoku Puzzles: Volume 3 (Sudoku Killer)

The Kill Lock

The Grid

250 Killer Sudoku: Easy to Medium Killer Sudoku Puzzles: Volume 6 (Sudoku Killer)

The Puzzle Murders (Solve Puzzles to Crack the Case!)

Kids' Killer Sudoku

The Guardian Killer Sudoku 2: A collection of more than 200 formidable puzzles (Guardian Puzzle Books)

Logic Problems: 60 Logic Grid Puzzles

250 Killer Sudoku: Medium to Hard Killer Sudoku Puzzles: Volume 7 (Sudoku Killer)

The Killing Site

World's Hardest Killer Sudoku: Is Your IQ Good Enough to Solve These INSANE Puzzles?: 1 (Killer Sudoku: The Master 45-Sum Architecture)

Xiangqi Puzzles Three Moves Kill

Murder In The Maze

400 Killer Sudoku: Hard to Very Hard Killer Sudoku Puzzles: Volume 16 (Sudoku Killer)

Xiangqi Puzzles Two Moves Kill

Killing Ground

Killer Sudoku Adult Puzzle Book: 1000 Medium Killer Sudoku (9x9) Puzzles (The Big Books of Logic Puzzles Series)

400 Killer Sudoku: Medium to Hard Killer Sudoku Puzzles: Volume 15 (Sudoku Killer)

400 Killer Sudoku: Hard Killer Sudoku Puzzles: Volume 12 (Sudoku Killer)

Logic Puzzles: 60 Logic Grid Puzzles