Sudoku for Nikolaus 2005

 [Explanation] [New Nikolaus Game] [New Puzzle] [Recall Puzzle]

A Nikolaus Sudoku Puzzle

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

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:


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

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