駄目、中々、為、など Are classified as "rare" kanji, but I know I've seen them often in RPGs in other Japanese games. I know when I went karaoke in Japan, some old songs used stuff like 此れin the lyrics. So, in the end, are they really "rare"?
Actually, what defines "rare"? Are these kanji outside of the JLPT scope? I'm keeping the "rare" kanji option on (can't see how learning more kanji is a bad thing), but I'm just curious. Even though I'm still working on the last bit of 3kyu vocab, it feels like I have a bit of 2kyu and 1kyu knowledge crammed into me from studying "rare" kanji.
With that said, it should make the transition to studying 2kyu kanji easier than just having hundreds of new kanji thrown at me. It feels like Skritter spreads out both characters and vocabulary well.