Meryl Silverburgh’s Codec frequency in Metal Gear Solid is 140.15.
Players need this frequency to contact Meryl during the Shadow Moses mission. It is printed on the back of the game’s physical case, making the packaging part of the puzzle in the original release. The use of an external clue became one of the game’s most famous fourth-wall moments.
The Codec is the series’ radio communication system, allowing Solid Snake to receive mission briefings, tactical advice, and character conversations. Meryl’s frequency is easy to confuse with other radio channels used by Snake’s support team, so the exact decimal value matters. In later ports and digital versions, the clue may be presented differently, but 140.15 remains the canonical frequency associated with Meryl in the original game.