1036 Extreme Sudoku Challenges: Not-So-Easy to Tough Puzzles
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Not-So-Easy to Really Hard You've mastered plenty of easy puzzles and now you want to push yourself to the limit. Train to be the best, taking each new challenge as it comes. Here's the best, most enjoyable way to do it: The puzzles in this collection start out at a not-so-easy level, but become harder with every 250 you complete. The last 36 are tough and recommended only for champions!To complete sudoku puzzles, all you need to know is one simple rule: Fill in the boxes so that each of the nine rows, each of the nine columns, and each of the 3 x 3 sections contain all the numbers from 1 to 9. Your mental workout begins now!
