Unity is probably the most popular game engine for mobiles right now. There are a lot of books and online tutorials on this topic, so what does this one offer? Unity Android Game Development by Example Beginner's Guide will give you exactly what the title promises - beginner's guide. And it does it well.

Kana Karate from Aztecbyte is an educational game for people who want to learn English, Spanish, German, Portuguese, French, Italian vocabulary and especially the Japanese writing system. The system itself is complicated - there is Hiragana and Katakana (together called Kana) and Kanji. Learning it is all about drill. There's plenty of apps that can help you learn it, but I can say that this one is definitely the most fun!