Get the PAL Keycard from Meryl in Metal Gear's Nuke Building B1. It's crucial for disabling the Metal Gear launch system.
Found: You receive the PAL Keycard from Meryl when you first meet her in the Nuke Building B1 area.
This item is the single most important item in the main game of Metal Gear. You will need to use the PAL Keycard to turn off the Metal Gear launch system. It has the ability to change shapes at different temperatures.
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