So had a question here that I couldn't find the answer to.
In ShadowFall Mountain Encounter 2 - the setup rules are as follows;
The overlord collects 1 blue, 1 red 1 white, and 1 green objective token. If each hero moved off the map through the exit during encounter 1, the heroes choose the colour of 1 of these objective tokens and the overlord sets it aside, Then, the overlord chooses 1 of the remaining objective tokens, places it in his play area, and sets the remaining objective tokens aside (See Light in the Darkness). The heroes should not know the colour of the chosen objective token."
So based on this, the overlord has a single hidden objective token is his play area, that corresponds to one of the 4 doors marked on the map. Each door on the map is marked with a specific token colour.
But then Light in the Darkness reads;
"Each time a door is destroyed, the overlord reveals the corresponding objective token, if the overlord reveals the objective token in his play area, Kadlasars lair is exposed."
So from the sound of this, its the tokens on the doors that are hidden (scrambled?) and the OL token in his play area that is displayed. I was unable to find any other posted questions about this or an answered FAQ.