Unlockable stage

An unlockable stage is a stage that is not available at the start of the game (unlike a starter stage), but must be unlocked. Just like an unlockable character, it is required to accomplish a particular in-game feat and once completed, a message will tell the player, that the stage was unlocked.

List of unlockable stages
The following stages appear as unlockable stages, the requirements to unlock them is also included:

In Super Smash Flash 2
Any information is unknown.

Trivia

 * Beginning with demo v0.7, some stages could be only avalaible by meeting certain criteria but eventually made it as starter stages. These stages include Chaos Shrine, who was unlocked by unlocking ; Sand Ocean, who was unlocked by playing 10 brawls with ; and Clock Town was unlocked by accumulating a total of less than 20 seconds with the nineteen starter characters in Target Smash.