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Mu Models Sugarcane Harvester Model! By bending and twisting flat sheets of metal you can create your own metal sugarcane harvester (will not actually harvest sugarcane)

If you are finding those "Advanced" newspaper sudokus ridiculously easy, it's time to ramp it up! This is NOT a book for the beginner. Beginning with challenging, the books increase in difficulty through the levels. Level #1 requires only basic and intermediate techniques to solve; Levels 2 and 3 add more advanced techniques; by Level 4, puzzles require multiple advanced techniques. However, these are all solvable by logic puzzles; none of them requires guessing to complete. So, after cutting your teeth in Mastering Sudoku Week by Week, you can practice some pencil-biting in this series. All answers are included in the back of the book.