What kind of file type is required to upload a sudoku that I created?

[Modesty]

You can find help here:

https://logic-masters.de/Raetselportal/H...?chlang=en

Once all requirements are met you can start. Most puzzles require a puzzle diagram. You can upload image files to our server using the upload files page. If the upload is successful you will see a six-character image ID. The following file formats are recognised: PNG, JPEG, GIF, BMP, TIFF, XCF, PS, and EPS. If your puzzle diagram is available in a different format you have to convert it to one fo these formats first. Watch out: you can also upload PDF files for the contest engine, but you can't use PDF files in the puzzle portal!