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"The 13th Struggle" is a Field Battle track in Kingdom Hearts Melody of Memory. The Field Battle stage is set in Castle Oblivion as it appears in Kingdom Hearts Re:Chain of Memories, referencing the track's usage in boss battles against various Organization XIII members stationed there. It is unlocked after clearing Castle Oblivion in World Tour.
The Co-op version of the "The 13th Struggle" Field Battle is unlocked after clearing 2 Co-op stages.