Can you tell which number goes in the red frame in this 4x4 Sudoku?
Great, you answered "4".
See here what other people have answered:
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Click "CONTINUE" to proceed to the next question
Interesting fact:
Even if you spent every second of your entire life doing Sudoku puzzles, you will never run out of new ones – there are 6,670,903,752,021,072,936,960 possible combinations, more than enough for several dozen lifetimes!