In the game, the Beer Maid in question is Heidi, a friendly blonde kellner who also acts as the star of the show and a key symbol on the slot machine reels. 15, 2023 9 minute read Heidi's Bier Haus Slot Game Theme and OverviewĪs you may have guessed from its unusual name, the 6-reel WMS Heidi's Bier Haus game is inspired by the beer gardens, cellar bars, ale festivals, and picturesque beer halls of Bavaria.