Ketsui DS has an official site, and while all sections are filled in, what you should really be looking at is the extra features. It's pretty impressive. They've got game sharing, wherein a second player can download a boss attack mode from you, for one thing. Next there's a replay mode. You play, the replay is saved, and you can watch it again, and send it to friends wirelessly as well. There's an Evac Report thing which I don't really understand, and then best of all, there's the "oshiete IKD san!" mode, in which Cave president IKD gives you tips and tricks. If this mode were really built out, it could actually teach you how to get better at shooters.