Here's a spoiler-free guide on how to leave the Captain's Quarters in 999.
999 - How To Escape The Captain's Quarters Spoiler-Free Guide
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Chart room, Zero Escape Wiki
999 - How To Escape The Captain's Quarters Spoiler-Free Guide
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999 - How To Escape The Captain's Quarters Spoiler-Free Guide
Captain's Quarters, Zero Escape Wiki
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999 - How To Escape The Captain's Quarters Spoiler-Free Guide