Welcome to Pdfnew. Pdfnew is an app we built with our hearts. If you have any questions or suggestions, you can let us know by email or in the comments, and we will improve and optimize the problems you mentioned in the next version. Lets build better products together.
It is an application that can develop mental thinking. The application rules are to select the numbers in the lower cells and fill in the upper cells, so that the numbers in each row, column, and diagonal match The numbers in the upper cells cannot be repeated, and we hope it can help you better exercise your mental thinking