I haven't played them yet, but I did manage to collect all 3 just by trading here on the Forum.
While they do look fun, the Hiragana and Katakana wouldn't be much of a challenge for me, it would be good practice though, because sometimes it takes me a little bit to remember how to draw one. To be more specific, some of them look alike:
Hiragana: はHA けKE
Hiragana: ろRO るRU
Hiragana: フFU ウU
Katakana: アA マMA
は
HA can become ば
BA and ぱ
PA (BA looks like it has a little quotation mark next to it, PA looks like a little circle is next to it). You have to enlarge those with a large font to really see the difference clearly, and those same marks apply to other characters like せSEぜZEさSAざZA
I've been practicing those as I read the words in the Kanji book, they spell out the pronunciations, and I study the spelling and remember the differences that way. Honestly, I trace the characters by pointing at the screen and drawing them with my finger as I pronounce it (whispering), it's recommended that you draw it with pen and paper over and over again, but I think it's roughly the same.
I did study Hiragana and Katakana seriously at first to get to a decent level with it, then I started doing what I said above as practice (so that's my advice to you if you're going to try to learn from a video game or whatever, take it serious at first, then game as practice).
The games have random beginner words, so that would be helpful (for me) to brush up on those, the real challenge and learning experience for my level would be Kanji Combat. Kanji is where Japanese starts to get really challenging, I'm studying those from a book, not taking it too seriously, but when I get a little more experience with Kanji, I'll start playing the games and jump back into my Genki book (which I abandoned after the Kanji started annoying me).
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Mordor Frappuccino Raffle 
Congrats to the winner 
so I'm sick as fuck again rn.
