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Difficult Sudoku-12 Group Puzzle

The grouppuzzles.com Difficult Sudoku-12 puzzle for Thursday July 22, 2021

There are 9 steps required to solve the puzzle above with a total of 86 empty locations that must be determined .

Display the puzzle with superscripts showing the step number for the first 3 steps in their empty grid location.

Explain all of the deductive steps required to solve this puzzle.

See the puzzle answer grid.

Thursday July 22, 2021   http://www.grouppuzzles.com