Planetoid G-3 is unlocked after obtaining Planetoid Map G-3 on Planetoid G-2. Planetoid G-3 is the last top-down planetoid; it consists of six rooms. The first room only features the dungeon entrance/exit. The second room features a boss fight against Mighty Mine Mite. The third room features a boss fight against Unknown Cell-046. The fourth room features a boss fight against Mockrantula. The fifth room features a Retry Point and breakable rocks to obtain Capsules. The sixth room features a boss fight against Leibniz; defeating him gives access to Planet ??? Map.
- Planet ??? Map