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Sector B is the second extra stage in Fortress of Shadows - Jambastion, a level in Kirby Star Allies. It can be reached upon activating the big switch in Western Outer Wall. It is the only stage in Story Mode to use the Friend Train.
|The Great Labyrinth Battle||Complete all of the jumps in the Friend Train segment.|
- This level contains Neo Star's level music and "Vs. Miracle Matter" from Kirby 64: The Crystal Shards.
- The mural for Bandana Waddle Dee is located in the fourth room after making the first two jumps.