Bio-Research Facility - Room with Giant Mushrooms and Valve Puzzle
Follow the walkway to the right. A brief cutscene shows a huge vine pulling the exit doors shut and holding them fast.
Climb/drop down to the ground.
Head for the raised walkway opposite the door with the vine. Underneath you'll find a Mag Vega clip (15). Climb the stairs to the valves.
Each of the 5 valves is labeled with an arcane symbol. The diagrams on the bulletin board to the left show different chemical mixtures you can make by turning different valves.
Push the table away from the bulletin board to reveal a clue.
The diagram with the red X shows a bad mixture for plants.
Turn the valves corresponding to the symbols shown in that diagram: Valves 1, 2, and 4 from left to right.
Now pull the lever on the right.
This feeds the bad mixture to the giant vine, killing it and opening the doors.
Exit there.
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