Put the numbers from 1 to 6 in the puzzle in a way such that:

  1. In each row or column there shouldn't are no duplicate numbers.
  2. The squares that are joined together have the same number.

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1 Answer 1


I found one solution and i dont think there is another. The red marked four is the first number you can fill in.

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  • $\begingroup$ This is what I got too. $\endgroup$ Commented Aug 14, 2014 at 12:14
  • $\begingroup$ The 3 on the right side can also be the first number you can fill in. Try putting it in the others cells and it will add a 3 in the 4th column or the last row which is invalid. $\endgroup$ Commented Jun 2, 2017 at 6:42
  • $\begingroup$ @alixeisenhardt , how does one proceed after filling the 4s ? $\endgroup$ Commented Jul 27, 2023 at 5:22

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