Zwei!! (ツヴァイ!!, Tsuvai!!) is an action role-playing game developed by Nihon Falcom Corporation. It has been released on three platforms so far: Windows, PS2 and the PSP. The title itself is derived from the German word "zwei" meaning "two". An online version called Zwei!! Online, developed by Korean developer Neonsoft Corporation, was announced on August 2, 2007.