Banned stages cannot be chosen at all. Stages can be banned for several reasons, common reasons including but not limited to:
Read the text in red now watch this clip: https://www.youtube.com/watch?v=vUdBt7GG2OU (skip to 1:08 for some real weird stuff)
- Especially poor matchup balance by providing a rather extreme advantage for certain characters (such as allowing the character to utilise excessive, gamebreaking camping, or utilise infinite chain throws, as in the case of Fox in Temple for the former, or King Dedede in Shadow Moses Island for the latter).
- Powerful stage hazards that can easily KO players who are knocked into them, or force players to give up an advantage to avoid them. An extreme example of this is Gamer.
- Allowing players to abuse glitches in the game
- Possessing one or more "caves of life," allowing characters to survive much longer than feasibly possible under usual circumstances, and creating a general over-centralisation on the ability to tech.
- Possessing permanent walk-off blast lines and walls; the former creates unreasonably powerful camping positions and allow for potential easy zero-deaths that wouldn't occur normally, as well as marginalizing or completely eliminating offstage play (nullifying the value of a good recovery), while the latter also creates powerful camping positions and allow for zero-death or otherwise heavily damaging combos that wouldn't be possible otherwise. Walk-offs and walls that occur only temporarily on a stage are considered detrimental, but acceptable enough to usually not result in a stage's banning by themselves.
- Drastically altering gameplay and the strategies needed to win (such as Icicle Mountain and Mario Bros.).
- Possessing elements that causes the stage to be too strenuous on the system's CPU and thus being capable of reducing the game's frame rate mid-match (such as Fountain of Dreams in Melee doubles play).
Read the text in red now watch this clip: https://www.youtube.com/watch?v=vUdBt7GG2OU (skip to 1:08 for some real weird stuff)