Norfair

From Smash Bros - Wiki on Neoseeker

The stage Norfair is based off of the Metroid series and is Ridley's home.This stage has 5 floating plat forms as well as lava at the bottom of the stage.The lava will occasionally rise and hurt the players.After a few turns of lava appearing, a massive lava wave will take control of the stage thus making a safety place for players to protect themselves from the lava, however the safety place is very small, so if you get in don't let anyone else in! The huge lava wave can be avoided with a big jump over the wave although it's quite hard to pull off. Lava could come from the left and fill half the stage, or come from the right and fill half the stage there.