{"localization":"PetitPierre is right. The stars of difficulty depend on a \u0026quot;formula\u0026quot; determined according to the number of black boxes and lengths of sequences. I know something about it since my last 190 creations have - voluntarily - 5 stars of difficulty. The secret to a grid is simple: it lies in the due diligence and adjustments you manage to make to it along the way. There is no other and it takes time, trial and error. The design itself does not matter for this reason, but when there is too much black I personally find it uninteresting ...","ok":true}