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Calcudoku puzzles

My database includes 4597 puzzles for the moment and I'm constantly generating more.

Rules: Fill in the grid so that every row and every column contains the digits 1 through 9. Each box must also be calculated according to number and operator. There is only 1 solution for each puzzle.

For more information check out Wikipedia.

30*
1680*
4-
13+
21*
224*
432*
5+
11+
9+
1-
13+
9*
120960*
2-
24*
108*
6+
2-
280*
30*
3-
63*
3/
5-
1-
36*
252*
18+
7+
Showing puzzle number: 561
Puzzletype: Plus,Minus,Multiply,Divide
Startnumbers: 81
Difficulty: Impossible ()
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