Kana DS is a homebrew game targeted at new students of the Japanese language.
It aims to strengthen the player's reading and writing skills for the hiragana and katakana charsets, as well as some of the most basic kanjis. Currently, only the hiragana/katakana reference table and one of the mini-games are implemented.
In the future, more mini-games will be added, as well as a system to track the progress of the user and adapt the difficulty of the games accordingly. Handwritting recognition of 'kanas' is also on the way, with a working applet prototype available at the blog of the project.
A video has been uploaded to YouTube to show the current state of the game: