EduPuz Group Puzzle Type 'Sudoku-15'

Difficult Sudoku-15 puzzle for Tuesday July 14, 2009 with the first 3 steps marked

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There are 11 steps required to solve the puzzle above with a total of 116 empty locations that must be determined .

The locations for the first 3 steps are marked in the puzzle above.

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

See the puzzle answer grid.

Tuesday July 14, 2009   http://mysite.verizon.net/edupuz