Krychle Sudoku 4x4: 120 3D Sudoku Cubes, 3 grids in 1 by Sudoku Magazine, Paperback

Fill in the cube so that on all sides of the cube so that each digit appears exactly once in every row, column, and outlined 2×2 region. Additionally, the digit on the common edge of two sides must be the same number.

Puzzle Puzzle Mind - Sudoku Valentine's Day Sudoku vol.4 by Puzzle

Loftus Sudoku Puzzle Cube - A Fun Portable Take On The

Sudoku Magazine: books, biography, latest update

Loftus Sudoku Puzzle Cube - A Fun Portable Take On The

Chronicle Books Sudoku 3: Hard to Extreme: 200 Puzzles

Chronicle Books Sudoku 3: Hard to Extreme: 200 Puzzles

Chronicle Books Sudoku 3: Hard to Extreme: 200 Puzzles

Sudoku for Third Grade: 150 Puzzles by Jacobs, Esther

Sudoku Magazine: books, biography, latest update

Chronicle Books Sudoku 3: Hard to Extreme: 200 Puzzles

Loftus Sudoku Puzzle Cube - A Fun Portable Take On The

Chronicle Books Sudoku 3: Hard to Extreme: 200 Puzzles