Warning (a huge spoiler is approaching fast) this post about Kingdom Hearts: Birth by Sleep Final Mix has spoilers so you may want to skip it if you’re bothered by that kind of thing.
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According to Shonen Jump, the playable secret episode in Kingdom Hearts: Birth by Sleep Final Mix stars Aqua after being sealed in the World of Darkness. Yes, you get to explore this world and fight battles in it. Shonen Jump says the true last battle is in this episode and the creature with the glowing red eyes appears to be the target. The magazine hints there will be a tough fight with the mysterious foe.
Players can unlock the secret episode after fulfilling certain conditions in Kingdom Hearts: Birth by Sleep Final Mix. These were not revealed in the issue.
Kingdom Hearts: Birth by Sleep Final Mix comes out this week in Japan.