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 were available only after meeting certain criteria. However, these stages were unlocked from the start in later demos. These stages include Chaos Shrine, which was unlocked by unlocking ; Sand Ocean, which was unlocked by playing 10 brawls with ; and Clock Town, which was unlocked by accumulating a total of less than 5 minutes with the nineteen starter characters in Target Smash.