Do you know what the number 6,670,903,752,021,072,936,960 stands for? It’s the number of possible (9 by 9) Sudoku grids, as calculated by Bertram Felgenhauer. Since we saw so many Sudoku books on our last trip to London, and Amy started doing the puzzles on her way to work, I decided to pick up a small book of Sudoku puzzles myself. This was only last week and already I am hooked; it’s incredible how addicting these puzzles are, and how quickly I am longing for new and more complicated ones.
Here are a couple of great sites with Sudoku tips and information: