The Serial Core's first form is almost exactly same as the Crystal Core from Gradius 2 Arcade. Notably, the core will not move if you stay directly in front of it. The second form is slightly more difficult, and fires two triple lasers. The second form also releases large crystals that zoom along the top and bottom of the screen. Finally, the third form creates a shield out of large crystal parts, which spiral around the core at high speed. While it is doing this, it will chase you while constantly firing a stream of aimed lasers; simply move to avoid them.