If you like an intellectual challenge, then you might enjoy Sudoku. The puzzles are 9x9 grids containing 81 spaces. Of these, 20% to 40% are preloaded; then it is up to you to supply the remaining numbers to complete the puzzle. We'll start with the easiest puzzles and gradually increase the pain level until we conclude with the diabolical one's! At each level along the way, we will provide you with step-by-step instructions and hacks. As you digest each new method of attacking the puzzles, you will eventually become equipped to conquer any Sudoku. If you are up to the challenge, let's get started!