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Gastly creates a spatial loop in USUM:
"Night, stairs, cursed. You go up and up, but still same place. You can't go down, either. Circle, circle. Can't go back."
"Once they reach 2F, the player feels a cold breeze. Even if they go up or down the stairs, they remain on 2F. If the player goes to the west side of the floor, they notice the bulletin board. One piece of paper has black stains on it, which indicates the lower left, upper left, lower right, then upper right corner. If the player steps on the sparkles on the floor in these corners of 2F in that order, they can use the stairs again. When proceeding to 1F, they are immediately attacked by a wild Gastly."
Trainers' School (Alola) - Bulbapedia, the community-driven Pokémon encyclopedia
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"Night, stairs, cursed. You go up and up, but still same place. You can't go down, either. Circle, circle. Can't go back."
"Once they reach 2F, the player feels a cold breeze. Even if they go up or down the stairs, they remain on 2F. If the player goes to the west side of the floor, they notice the bulletin board. One piece of paper has black stains on it, which indicates the lower left, upper left, lower right, then upper right corner. If the player steps on the sparkles on the floor in these corners of 2F in that order, they can use the stairs again. When proceeding to 1F, they are immediately attacked by a wild Gastly."