Castle Siege

Mario, Link, Pit, and Meta Knight fighting on the castle's exterior.

The Castle is a confirmed stage for SSBB. Its name and series are unknown, though it resembles something that would be found in a Zelda or Fire Emblem game. It is more likely to be a fire emblem stage, as Castles in Hyrule have never been attacked with catapults, like this stage is. Also, the flags on the exterior and interior are very similar to some in Fire Emblem 9: Path Of Radiance.

Like the Helipad stage, this stage appears to have both an exterior and an interior, of which the connection is unknown. They could be seperate stages, or they could be one and the same. For simplicity, they are currently regarded as the same.