Sudoku pits your logic skills against a real human ghost. Fill the 9x9 grid so that every row, column, and 3x3 box contains the numbers 1 through 9 exactly once.
The Twist: As the ghost places numbers, they will appear faintly on your board. This gives you free hints if you are stuck, but serves as a ticking clock warning you exactly how close they are to winning the puzzle race!
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