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# What variants of calcudoku are there?

Several variants of this puzzle exist.

The most common is the single operation calcudoku, that requires you just to use, say, addition or multiplication.

Other variants allow negative numbers, so that on the subtractions for instance 0 and lower may be allowable.

Other variant puzzles have a different set of numbers rather than the standard 1 to 5 or 1 to 6, occasionally even negative numbers are allowed such as placing -3,-2,-1,1,2,3 in the cells.

Finally missing operation calcudoku also exist whereby you must work out what mathematical operation must appear in a region in order to make a valid puzzle.

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