Backrooms: Facility Unknown - 是一款关于探索危险的阈限空间的合作恐怖游戏。独自或与朋友一起在建筑群中漫步。无论如何，你的任务就是做好你的工作并生存。

On your daily "commute" from work, you may sometimes encounter some situations. Please observe your surroundings care...