Planetoid C-3 is unlocked after obtaining Planetoid Map C-3 on Planetoid C-1. Planetoid C-3 is the second top-down planetoid; it consists of four rooms. The first room only features the dungeon entrance/exit. The second room features a lockdown segment, featuring Cables, Silverfish, and GX680s. The third room features a Retry Point. The fourth room features a boss fight against Mighty Mine Mite; defeating it gives access to the Torch Bomb Sub-weapon.