まずは余談です。かねがね気になりつつも、どうでもいいやと思って放っておいた案件を、このたびGoogleに尋ねてみました。"multi player game" = 643,000 件"multi players game" = 122,000 件"multi player's game" = 72 件"multi players' game" = 122,000 件"multi-player game" = 643,000 件"multi-players game" = 122,000 件"multi-player's game" = 72 件"multi-players' game" = 122,000 件"multiplayer game" = 11,200,000 件"multiplayers game" = 18,300 件曰く、「マルチプレイヤー・ゲーム」が優勢の様子です。しかし