A room always has one of the possible exploration modes in it, which change randomly over time. Each mode determines the exploration conditions, and some modes may even cause interference. For instance, in Silhouette mode players see silhouettes of hidden objects instead of the names of the objects. In Night mode, exploration takes place in a dark room. Special icons on the map will tell you which modes are active in which rooms.
To complete a quest that requires you to find an item in a certain mode, keep exploring a room until the needed mode activates.
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