The "Fortress of Doors" is third piece of the Original Soundtrack produced by Chris Vrenna. It is used during the opening of the Fortress of Doors level, but is not used during any of the Skool-related sections. The piece features many sound effects, including wind and gust related noises. This is probably due to the fact that the opening of the Fortress of Doors has Alice manipulating her way through various moving and broken platforms through what appears to be portals that suck the level around, thus creating a wind-effect. The piece features dialogue from both Alice and the Cheshire Cat.