25x25 Sudoku Puzzle Book Medium: Irregular Sudoku Variations Brain Logic Games For Adults : Edward Sevensam: Amazon.com.au: Books
Looking for a great sudoku pen that can write small, not smudge, and still be legible. If anyone has any suggestion. I started doing these 25x25 sudoku puzzles and it's really hard
Sudoku 25x25 Volume 13: Sudoku Xtra Specials (Paperback) | Little Shop of Stories
25 x 25 Suduko Puzzles: 75 Easy, Medium and Hard Sudoku Puzzles - Fry, Charlie: 9781523438945 - AbeBooks
Alphadoku image example, 25X25 sudoku puzzle, symmetric, beginner No. 1