In other levels, referred to as "Maze Levels" in the game's instruction manual, Superman has found one of his friends from within one of Luthor's outposts, and must escape with them and defeat a boss. These levels are generally more rooted in action-adventure, and make great use of puzzle-solving. The game's "virtual Metropolis" in which these stages take place is filled with what the developers called "Kryptonite fog" in an apparent effort by Lex Luthor to diminish Superman's abilities (which is actually distance fog and is used as a technique to mask the game's poor draw distance).