German is tricky that way. In this case the literal translation of "war game" does not exist because to the German ear those two words must be expressed in a wa

German is tricky that way. In this case the literal translation of "war game" does not exist because to the German ear those two words must be expressed in a way that suggests a relationship between them. The additional "s" accomplishes that, in essence the phrase becomes a contraction of Krieg's-Spiel (apostrophe added for better readability) which is a special short form that developed from "Spiel des Kriegs" or, translated, "game of war". That said, as a project name Kriegspiel is totally fine. :)