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在""传送门1""中，铁圈(Hoopy the Hoop), 是一个在传送门1结尾GLaDOS被摧毁后从GLaDOS身上掉落的零件。爆炸发生过后，铁圈掉落在雪儿面前。在被派对同仁机器人拖回设施前你可以非常清楚的看见落在你旁边的铁圈。
Hoopy is known to appear in a few places within Portal 2. Its earliest known appearance is in GLaDOS' ruined chamber, where it lays slightly to the left of what could be described as GLaDOS' head; its second known appearance is underneath a floor panel in Test Chamber 02. It then makes its third known appearance behind a desk in Rattmann's den in Test Chamber 06; this is the same den as referred to by the Final Transmission achievement.
Hoopy's fourth appearance is in one of the randomly-chosen exit corridors in chambers created with the Perpetual Testing Initiative. It is seen by noclipping into the ceilings of the exit corridor, although it doesn't appear in every one.
