A good game, definitely not for beginners.
I've studied japanese for 3 years, but I still have many problems with kanji, so I thought it would be great to play a game that is designed for japanese students...Now I can say I made a good choice, but it would have been more helpful if I knew a little more japanese.
This game definitely helps you when you're practicing the writing, but also the reading of the kanji, with a little dictionary that explains the meaning and the different readings of every kanji with many examples. Unfortunately, being this game designed for japanese people, it is often frustrating: you cannot understand what a kanji means directly from the explanation of the game (obviously written in japanese), and many examples are very difficult to remember (sometimes nearly impossble).
If you are a beginner, the "drill" section is absolutely USELESS (you have to know at least 1000 kanji to play the easiest mode without getting mad) and the last section requires intense preparation because it will test your knowledge on both reading and meaning, and you have to remember by heart every single reading and combination of kanji taken from the examples.
In the end, the game is not bad, but if you are a total beginner, prepare for your worst japanese nightmare! If you can resist it, you'll surely become a kanji no kamisama XD!