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Room B6 "Central Checkpoint"
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Three different routes lead to the central room.
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Each includes an arrow you can only reach via that route. Make your way back to other routes by using the orange vactubes.
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The arrows aren't much use where they are.
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Is there a way to get them into the central room?
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Push each arrow through the appropriate vactube to place it in the central room. Line the arrows up to open the door.