Nikolaus Home Registration Participants Program Sudoku Photos

Sudoku for Nikolaus 2005

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A Nikolaus Sudoku Puzzle

1 6 8	2 3	9
4 9 3 6 7	8 5	6 8
5 9	2 4 9	6 8 4

How many possibilities are there to add one symbol such that the board becomes a (uniquely solvable) Sudoku puzzle?

Number:

To prove that you have not just guessed the number, also give three of the possibilities (or all possibilities, if there are less than three):
Row: Column: Symbol:
Row: Column: Symbol:
Row: Column: Symbol:

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Questions and suggestions to Frank.Luebeck@Math.RWTH-Aachen.De.