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No, you can do Sudoku with letters or shapes sometimes. You don't actually have to add or subtract or do math calculations when playing it.
It depends on which version of sudoku you are playing. Usually there is no time limit on sudoku, however on some electronic versions there will be an automatic timer and your game will reset.
You use the hint button.
You can download the specially designed blank playing layout by Caro Eardley from the Win At Sudoku site for free; see the link below.
Yes it has been know that doing sudoku will help your child with problem solving. I will not improve her book knowledge but it should help her critical thinking ability.
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Given the benefits of learning and becoming skillful at Sudoku, I would have to say that there ARE no disadvantages of playing it. However, the process of LEARNING to do well at it can be quite time consuming, as is any newly learned skill. If you could come up with any disagreeable aspect of Sudoku, it would be that it takes so much time to be very good at it.
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there is no real satistics to a sudoku so unluky the are many ways to do a sudoku
Sudoku is a noun.
Any puzzle will help your child with critical thinking skills so sudoku will be good for that. Suduku has numbers in it but it does not involve any math so it wont help your son do better in math.