All-Star Rest Area

The All-Star Rest Area (オールスター休憩所, Ōrusutā Kyūkeisho, lit. "All-Star Rest Area") is a special stage used to warp between battles in All-Star Mode throughout all of the Super Smash Bros. games and in Super Smash Flash.

In Super Smash Flash
A stage using the same sprites as Floating Islands. The player can KO itself here without losing, thought it will respawn next to the door and it's damage is kept. If the player goes through the door while it is healing, the healing will stop and the next battle will start.

In Super Smash Flash 2
All-Star is not confirmed to the sequel, thus, Rest Area not too.