While not a 'side quest' in the traditional sense, striving for high scores and 'A+' grades is a significant part of Hotline Miami's replayability. Achieving high scores often unlocks new masks and provides a sense of mastery. To maximize your score, focus on maintaining long combos, performing executions, and using environmental kills. Speed is also a factor, so try to clear levels as quickly and efficiently as possible. Don't be afraid to restart a floor if your combo breaks or you take a hit. Practice makes perfect, and understanding enemy patrol patterns and weapon spawns will greatly aid your high score attempts.
