Flex your mental muscles with 80 medium difficulty Sudoku puzzles. Perfect for keeping your brain active, these puzzles will challenge you and fend off boredom without causing a headache. They aren't to easy but are still doable; perfect for people looking to move up from the easy level puzzles. Don't worry about getting stuck, the answers can be found at the back of the book. Logic puzzles are a great way of keeping your brain active. Give your mind...
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