return {
  actors = {
    {
      costume = "blue_ball",
      position = {
        x = 32,
        y = 32
      },
      role = "ball",
      velocity = {
        x = 1,
        y = 1
      }
    },
    {
      costume = "red_ball",
      position = {
        x = 64,
        y = 35
      },
      role = "ball",
      velocity = {
        x = 1,
        y = -1
      }
    }
  },
  bgcolor = 0,
  gravity = {
    x = 0,
    y = 1
  },
  palette = "blue_ball"
}