From my point of view, only these items from the TODO file have some relevance:
- Open games in tabs - tabs (will) have tear-off functionality
- Add logo in background when exporting / printing
- Extend export print functionality (multiple pages)
- Add world-wide high scores
- Add a puzzle-shape editor downloader & uploader
It should be checked with the bug list (https://bugs.kde.org/buglist.cgi?bug_status=UNCONFIRMED&bug_status=CONFIRMED&bug_status=ASSIGNED&bug_status=REOPENED&bug_status=NEEDSINFO&bug_status=VERIFIED&columnlist=product%2Ccomponent%2Cassigned_to%2Cbug_severity%2Cbug_status%2Cresolution%2Cshort_desc%2Cchangeddate&list_id=1517401&product=ksudoku&query_format=advanced) if they are already present there or if they should be added there.