It works perfectly on modern processors and operating systems. Unlike most other Quake II source ports Yamagi Quake II is fully 64 bit clean. Both the gameplay and the graphics are unchanged, but many bugs if the last official release were fixed and some nice to have features like widescreen support and a modern OpenGL 3.2 renderer were added. This is the Yamagi Quake II Client, an enhanced version of id Software's Quake II with focus on offline and coop gameplay.
This package only provides the engine, you need a valid copy of the (proprietary) game data to launch the game.