5
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enter image description here

If someone is able to find the solution... I found 2,3,8 on line 5, column 3-4-5, but after that I am blocked, it looks too difficult for me.

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    $\begingroup$ What do the X and V symbols mean? Please can you provide a link to the source of this puzzle including the rules for solving it? $\endgroup$ – Rand al'Thor Apr 4 at 20:13
  • $\begingroup$ X means two adjacent numbers add up to 10, and V means they add up to 5. $\endgroup$ – classicalMpk Apr 4 at 20:17
  • $\begingroup$ @Randal'Thor further, note that every possible X and V are placed already, giving the additional information that there is an X or V iff the two numbers adjacent sum to 10 or 5, respectively. $\endgroup$ – El-Guest Apr 4 at 20:39
  • $\begingroup$ And the sum of two adjacent numbers can not be 5 or 10 if there is not the sign X or V $\endgroup$ – perayu Apr 4 at 21:08
  • $\begingroup$ Did you create this puzzle yourself, like the previous ones, or did you find it somewhere? $\endgroup$ – Rand al'Thor Apr 4 at 21:31
6
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I believe this does the job (sorry for the crude drawing):

enter image description here

Unfortunately, that's too hard to explain in words (it took about 1.5 hours for me to solve, and it was 1:30 am in my time zone (UTC+3) at the time of posting).

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  • $\begingroup$ Congratulations ! It's all good... $\endgroup$ – perayu Apr 4 at 23:16
  • $\begingroup$ Yes, this is the correct solution. The trick to start is to understand that the 5 in row 8 is forced as is the 28 x-wing in rows 8 and 9. Once you have propagated all you can in the 6 bottom rows, you have to start using the rule that you can't have 5 or 10 sums that are not indicated on the grid. Good luck! $\endgroup$ – Stephane Apr 5 at 9:11
  • $\begingroup$ @Stephane Yes, I've basically used the same way, first the obvious numbers written in light blue, then the 5s (pink), then 3s and 7s in columns 4 and 6 (purple), etc. $\endgroup$ – trolley813 Apr 5 at 9:26

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