itch.io

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You mean after using the chemicals?
You can read the diary in the security office as soon as you get into the lab for the first time, it's near the lockers. The sewers are located south of the place where Helga took you, they are near some cells. The ghost is in the sewers. And the morgue is on the way to the paintings room and the statue gallery (the key to the morgue can be found in the sewers)

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