Most of the levels, apart from Worlds 0 and 1, consist of castle-type levels, hence the name.

After the warmup of the first world, one’s expected to venture through a long series of non-linear pipe mazes that get bigger and more puzzling through each world, and there are up to 5 worlds in total. A parallel world (0) also exists.

The difficulty level is around on par with SMB2J (except for the parallel world).

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