Saints Row: Gat out of Hell is an add-on sized successor to Saints Row IV. The main difference to the main game is the lack of story missions - the plot progresses by doing enough side missions. When enough chaos is created, a cutscene starts and a new side mission type gets unlocked. After the third cutscene, the player is ready to face the end boss. Other major differences are the city (Hell is new, but smaller in scope than Steelport), the lack of customization (the player either controls Gat or Kinzie) and no licensed music.