Thank you very much. But I noticed a strange bug (?). While playing I often get to hear a sound that reminds me of an electric guitar. I used the map "Duality" as singleplayer with a lot of monsters and a physics file with overpowered weapons. With normal physics, this sound is less frequent. EDIT: I solved the problem by commenting out the line p:play_sound(139) in brutal_marathon.lua.