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Notes
High scores and the ability to send recommendation emails are nonfunctional.Due to the lack of the PHP file for receiving high score submissions, the game would normally freeze during the submission process. To prevent this, the file’s equivalent from Sudoku Online is included instead. This doesn’t seem to cause any issues.
Source
http://event.faz.net/kopfballduell/ (via Wayback Machine)
Kopfball-Duell screenshots
