A Shoot'Em Up/Bullet Hell (sometimes) game series made by Treasure of Ikaruga fame, consisting of 3 games: Bangai-O on the N64 (only in Japan) and the Dreamcast, Bangai-O: Spirits on the DS, and Bangai-O: Missile Fury on Xbox Live Arcade. The N64 version had a limited run of about 10,000 copies, which makes it incredibly rare (and correspondingly incredibly expensive). The Dreamcast version was later released worldwide and is much more common.