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How about this one? Which number should you write in the marked square?
Great, you answered "3".
See here what other people have answered:
- 1
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- 4
Click "CONTINUE" to proceed to the next question
Interesting fact:
Appearances can be deceiving: Although Sudokus usually involve numbers, they are not mathematical in nature. There’s no arithmetic required, only a good sense of combining. That’s why Sudokus also work with any kind of symbols, colours, or letters.