404. That’s an error.
The requested URL /bookmarks/mark?op=add&title=Sudoku&bkmk=http://spiele.ronny-katja.de/index.php?params=game/13/ was not found on this server. That’s all we know.
/bookmarks/mark?op=add&title=Sudoku&bkmk=http://spiele.ronny-katja.de/index.php?params=game/13/