Stage legality

In competitive play, a banned stage is a stage that is not elegible for tournaments due to several reasons that may prove to be disruptive for a match such as poor match up balances (giving characters extreme advantages over other characters), "caves of life" that allow players to endure and survive attacks at high percetages much longer than under normal circumstances, big spaces and separated spots that promote camping, permanent walk-off blast lines, allowing players to exploit glitches for their advantage, etc..

List of banned stages in Super Smash Flash
This is the current ban list for Super Smash Flash, as of May 23, 2015.

List of banned stages in Super Smash Flash 2
This is the current ban list for Super Smash Flash 2 v0.9b, as of May 1, 2015. Note that this banlist only covers singles, as the competitive doubles metagame is virtually nonexistant at this time. It should be noted that all these stages are banned regardless of the hazard switch.