Step14はオープニングメッセージの表示 ;; Step14 <Start Game Message>;; -----------------------------------------------------------------------------------------------(defgeneric Game-start-message (pointer stage keystate)) (defmethod Game-start-message (pointe</start>…

step13は難易度を上げるステージの設定 ;; Step13 <Stage Class>;; -----------------------------------------------------------------------------------------------(defclass stage () ((%stage-flag :initarg :stage-flag :initform t :accessor stage-flag) (%stag</stage>…