Opened by a button located in the middle of the wall, it automatically closes after a while. It inflicts 4 times more damage than any other type of door.
Track Balls, Hovvers, Floaters, Bugs and both Guards can open a raiser wall by shooting at it. Since their bullet must come in contact with the center part of the wall, it is necessary for them to be alone in the group in order to be centered on the tile.
A closing raiser wall will obliterate any item under it when it's closed. For this reason, a Door-Man, Brains and any encounter with a map will not walk under an opened raiser wall to ensure their clipboard will not be destroyed which would prevent their related puzzle from being solved.
A maximum of 4 raiser walls can be simultaneously opened. It is very rare that a base will have more than 4 raiser walls next to each other, but it can happen. Base 6 of mission 54 has been found to be one of them.