The portal gun, officially the Aperture Science Handheld Portal Device, is the signature tool of Valve's Portal series, first released in 2007 and followed by Portal 2 in 2011. In the games it fires linked blue and orange portals that players walk through to solve puzzles and move through test chambers. Its firing sound became closely tied to that teleporting mechanic, and clips of it spread through gaming videos, edits and soundboards as creators reused it for transitions. It remains popular because the effect is short, distinctive and immediately understood by anyone who has played the games.