Alphadoku image example, 25X25 sudoku puzzle, symmetric, beginner No. 1
Sudoku 25x25 50 Giant Easy Sudoku Puzzles by Jacob James - 9781979203661 - Dymocks
25x25 Sudoku: 100 sudoku puzzles complete with solutions (Paperback) | Little Shop of Stories
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