A 游戏世界 can be permanently closed at the end of a season if it has one or less managers and it is administered by the SMFA. If a 游戏世界 is due to be closed then a warning message will be displayed within My Home.
However, to prevent this from happening the 自定义竞技场 owner needs to reclaim the 游戏世界 or alternatively it needs to be purchased as a pre-owned 自定义竞技场 no later than the last Turn of the season.