Banned stage

Banned stages are stages that are banned from most official tournaments. These stages can be banned for several reasons, including:
 * Providing an unfair advantage for certain characters (such as excessive camping)
 * Allowing players to abuse glitches in the game
 * Completely re-vamping the strategies needed to win (such as Temple and Icicle Mountain)
 * Having a significant amount of slow-down during a match

Banned stages in SSB

 * Yoshi's Island
 * Planet Zebes
 * Mushroom Kingdom
 * Sector Z

Banned in both singles and doubles

 * Brinstar Depths
 * Flat Zone
 * Great Bay
 * Icicle Mountain
 * Hyrule Temple
 * Yoshi's Island N64
 * Yoshi's Island (Pipes)
 * Big Blue
 * Princess Peach's Castle

Banned for Singles Only

 * Fourside

Banned for Doubles Only

 * Fountain of Dreams
 * Mute City

Varies

 * Onett