Ultrakill is a fast-paced retro-style first-person shooter developed by Arsi Hakita Patala and published by New Blood Interactive, first released in early access in 2020. The game draws heavily on 1990s shooters and character action games, with a distinctive electronic soundtrack and aggressive sound design. Its intro sound became a standalone clip on soundboards because players associated the short mechanical sting with starting a run. Fans now share it outside the game in edits, streams and memes, using it as shorthand for the game's speed and intensity.