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Don't tell me I have to play the whole game again?!? That gives a downgrade for bad gameplay.
Another downgrade for the stupid saturn rings question because the numer of visible rings variates with the magnification you have and can be anything between 1 (no cassini seperation), 2 (with cassini seperation) and anything above (including 7).
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thats the nitrogen bottle, you need to get the top for it its in a cabinet which you need a key for that is on the bookshelf.