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SUPER SUDOKU CHALLENGE
The fourth Kappa Puzzles Online Contest challenged solvers with a 16x16 sudoku puzzle using the letters A through P. When it was correctly solved (by filling in each square with a letter in such a way that every row, every column, and every 4x4 block contained exactly one each of the letters A through P), letters in the shaded squares—read from top to bottom—spelled out the answer to the contest, IN COLD BLOOD.
The contest ended March 31, 2006, and winners were chosen on April 3.
The solution to the puzzle is shown below. Click here to download a copy of the original puzzle for printing out and solving.

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