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The Gymnasium is an unreleased sub-realm for Royale High Campus 3 that was planned to release with phase 10. It is presumed that the main class in this sub-realm being Basketball, due to it appearing in the player's stats when they look in their Diary Planner.
On August 11, 2020, harht posted screenshots and a video of a gymnasium in which she was helping with finishing touches with callmehbob (Barbie)'s build.
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