Unlock New Game Plus
New Game Plus becomes unlocked when you have beaten the game and get an ending where Ib escapes. New Game Plus features a bonus dungeon that you can reach by going down the new stairs south of the reception desk (don't go into the Fabricated World painting). Completing the bonus dungeon will earn you the Black Key as a reward which lets you into the True Guertena exhibit upon getting another ending where Ib escapes.
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