A joint brand was established by Dreher Breweries and Mad Scientist Brewery

The Kőbánya X appears in two variants: in July, the Underground Lager, which is dedicated to the lovers of light, clean, light beers, and later the Catacombs Coffee Stout, which is aims at fans of dark, characteristic specialties. The recipes were co-created by the brewers, with the aim of crossing the technology and centuries-old knowledge of large factories with a fresh, experimental approach to small-scale brewing.