I had a record of acquiring this book years ago, but have been unable to locate it, and spotted another copy going cheap when in Ireland so filled the gap. Not really worth bothering with, as it turns out; Quidditch is a one-joke game, stretched here to over a hundred well-padded pages. I suppose that the detail of Quidditch history and technicalities may be a source of inspiration for fan fiction, but I would observe that most fanfic I have encountered features rather different leisure activities…
I see that the languages I am learning (or intend to soon) are all in the ‘hard’ section. From my own experience, Chinese is a lot more difficult than Japanese – certainly the writing system is a challenge, but ultimately a good memory is all you need, and there is a much smaller number of kanji in everyday use than in (say) a newspaper, whereas learning a tone accented language is a far more fundamental difficulty for anyone whose native language is stress accented. Of course other people may have a different experience. I’m expecting Korean to be no harder than Japanese, except for the rather crucial point that there seem to be far fewer learning materials available in English. I can’t comment on Arabic as I haven’t really started yet. Interesting that Slavic languages are rated harder than Romance languages – I suppose it makes sense in terms of vocabulary (I’m guessing there’s a lot less of Latin origin, for example?)