"classical" games should probably be "classic"
The KDE for Gamers page at https://kde.org/for/gamers/ has a heading which says "Explore our collection of classical games". To an English speaker this looks wrong.
Using random dictionaries:
Classic means "judged over a period of time to be of the highest quality and outstanding of its kind."
Classical means "of or relating to a form or system considered of first significance in earlier times"
They're close, but not the same.
It should say "Explore our collection of classic games" IMO