The observatory

Nested hint: Dr. Frankenstein is not very helpful.
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Nested hint: How can I get out of here?
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Nested hint: I can't reach the grate.
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Nested hint: Where do I find a key to unlock the grate?
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Nested hint: The key dropped through the floor grate.
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Nested hint: I can't get through the wall grate.
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Nested hint: How can I avoid Sara being killed?
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Nested hint: Where do I go now?
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