Hard Summer Sudoku

Summer Sudoku is heating up with Hard Sudoku, and this game is surely only for seasoned Summer Sudoku players who love a good challenge. Hard sudoku is played just like all easier sudoku boards before it - place the digits one to nine into all the columns, rows, and 3x3 boxes on the sudoku board only once. Hard Sudoku is named as such because answers will not always be easily evident at this level of sudoku play.