25x25 Sudoku: Keep Your Brain Active And Engaged With 100 Giant Hard Puzzles, Ultimate Sudoku Puzzle Book With Complete Solutions, Vol 10: Tahlia, Suzanna: 9798378325870: Amazon.com: Books
Alphadoku image example, 25X25 sudoku puzzle, asymmetric, expert No. 10000.
Sudoku 25x25 50 Giant Medium Sudoku Puzzles by James, Jacob: New (2017) | GreatBookPrices
Comprar Sudoku 25x25 50 Giant Medium Sudoku Puzzles (Libro en Inglés) De Jacob James - Buscalibre
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