Rainbow Sudoku

Who said sudoku had to be monotonous? These 180 multicolored puzzles are available in a variety of vibrant colors and patterns that add to the pleasure. Although they start with the regular 9x9 grid and follow the basic rules, each sudoku gives a unique spin on the classic: for example, every red square may contain a different number, or a puzzle may resemble a jigsaw. It's the ideal selection for problem solvers who appreciate a unique challenge.

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