Slipperiness

Slippery (sometimes referred to as slick, or ice physics) is a term used to describe certain platforms throughout the Super Smash Bros. series on which characters can slide and have worsened ability to control their movement. In Brawl, slippery platforms significantly increase the chances of prat falling.

The Ice Climbers have the unusual property of being able to walk along ice with no loss of traction.

List of platforms that are slippery

Melee

• Flat Zone: The oil slick in the center of the stage.
• Fourside: The surface of the UFO.
• Great Bay: The parts of the turtle's shell not covered by grass.
• Icicle Mountain: Many icy platforms.
• Mute City: The pink sections of the track.

Brawl

• Glacial Peak (and its recreation in The Great Maze): Various parts of the stage are icy.
• Iceberg: Turns all platforms slippery.
• Pokémon Stadium 2: In the ice change, the icy floor is slippery.
• Stage Builder stages: Ice blocks are a selectable terrain type.
• Summit: Much of the stage is ice.

Along with this, the Tingle Assist Trophy can cause all platforms of a stage to become slippery, among other effects.