One of the main features of underground-themed stages is that the stage takes place under certain levels and areas. Underground stages tend to follow other types of stages most notably plains-themed stages. Underground-themed stages can also associate with almost all other types of stages except for sky-themed stages for obivious reasons. Also, at most times, a stage will start out on the plains and the player then has to enter a Warp Pipe in order to get to the underground stage.