NOVELTY - The method for producing an inflammable gas mixture (BG) from carbon-containing materials (C1, C2, C3), comprises introducing a first carbon-containing material (C1) into a gasifier, producing a synthesis gas as a second carbon-containing material (C2) according to the principle of the thermal gasification in the gasifier, introducing the unfiltered synthesis gas produced in the gasifier and a third carbon-containing material (C3) into a biogas plant (BA), and producing the inflammable gas mixture in the biogas plant from the second and third materials.    USE - Method for producing an inflammable gas mixture from carbon-containing materials for motor vehicles or internal combustion engines.    ADVANTAGE - The method provides complete and optimal gasification of the product gas, thus simply and economically producing the inflammable gas mixture without any unwanted tar compounds e.g. high-boiling hydrocarbon as well as phenol and carbon.    DETAILED DESCRIPTION - The method for producing an inflammable gas mixture (BG) from carbon-containing materials (C1, C2, C3), comprises introducing a first carbon-containing material (C1) into a gasifier, producing a synthesis gas as a second carbon-containing material (C2) according to the principle of the thermal gasification in the gasifier, introducing the unfiltered synthesis gas produced in the gasifier and a third carbon-containing material (C3) into a biogas plant (BA), and producing the inflammable gas mixture in the biogas plant from the second and third materials. The synthesis gas is cooled before introducing into the biogas plant. The biogas plant comprises a percolating-liquid circuit, in which a condensate resulting in the cooling of the synthesis gas is supplied as a fourth carbon-containing material. An INDEPENDENT CLAIM is included for a device for producing an inflammable gas mixture from carbon-containing materials.    DESCRIPTION OF DRAWING(S) - The diagram shows a schematic representation of a method for producing an inflammable gas mixture (Drawing includes non-English language text).    Biogas plant (BA)    Inflammable gas mixture (BG)    Carbon-containing materials. (C1, C2, C3)