Interwar

Games where the action takes place during the Interbellum, that is between the First World War and the Second World War (1918-1939, more or less, depending on your country's vision of the world), or, in other words: in (roaring) 1920s and (dirty) 1930s. Fedora hats, Tommy guns, prohibition in USA, the Great Depression, jazz & swing, rapidly growing commercial aviation and radio, the beginnings of television, introduction of sound (& color) in movies, Art Deco, Bauhaus - and those classy curvy cars! But on the other side: the rise of Nazism/Fascism and Communism, which soon led everything to be Gone With The Wind.

Limitations* Exclude games that are set during either World War I or World War II. In certain cases exceptions can be made to extend the period to early 1940s: say, if the protagonist is a private eye on a Hollywood murder case in 1942, then it's all right to include the game here; but if the hero is a Resistance fighter in occupied France, then the game should go to World War II group. Games that are set in fantasy worlds that share certain stylistic elements with this real-world setting (such as for example Discworld Noir) should be excluded as well.