Portal is Valve's first-person puzzle game, first released in 2007, and its test chambers, robotic voice and distinctive music have made it a lasting favourite with players and editors. Radios and in-game broadcasts are part of that world, giving clips like this one an instantly recognisable retro science-fiction feel. Fans have shared Portal audio for years in gameplay videos, edits, memes and streams, often to signal a puzzle, a clever solution or a quiet, slightly unsettling moment. Its lo-fi, nostalgic tone keeps it useful long after the original game.