{"localization":"@Lilie: You could ask for help in a little more sympathetic way: if 450 people solved it without protesting on the lack of logic, it is probably because you cannot see the logic but that it exists ... \n After putting the obvious boxes in rows 11, 17 and 20, and in columns 5, 6 and 19, you should notice in column 17 that the first 8 and last 4 boxes have crosses . Likewise, there is a cross in C1L10, which allows you to put a black box in C1L18. Then a hypothesis in temporary cross mode in C1L19 will quickly prove to be invalid. You can then place the 7 of C2 and therefore the 8 of C1. From there, by putting the boxes and the crosses step by step, you should get there ...","ok":true}