Two children played on the rocks at the Mississippi Headwaters in Itasca State Park.
Photo: Aaron Lavinsky / Star Tribune
No need for a pen or pencil, Sudoku is officially online! Click a number followed by an empty box to place it. Fill the entire grid 1-9 on each row, column, and 3x3 square with no repeating numbers to win. Are your Sudoku skills strong enough?
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