Okay, so I'm addicted to Killer Sudoku and Kakuro, two very difficult versions of the Sudoku puzzles. (Sudoku is actually a 'child' of the more difficult Kakuro.) Now please know that I make a lot of mistakes and only complete the 'easy' ones (without cheating.)
Try these online versions for free: Killer Sudoku (with daily and weekly puzzles) and my favorite Kakuro, PuzzleMix and Sudoko sites. You can purchase inexpensive copies for your desktop as well but the online versions work well.
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