Luigi's Mansion

Luigi's Mansion is a stage speculated to be in Super Smash Bros. Brawl. A screenshot shown in the Nintendo Confrence Fall 2007 trailer shows Squirtle using Surf in what appears to be a Luigi's Mansion stage. An outline of a house and a withered tree can be seen in the lower-right corner of the shot, which makes it clear to be a Luigi's Mansion stage.