Well, yes. The Wii would not be able to handle the processing or graphical power trying to play this game. Even if the graphics were downgraded to suit the Wii, it still couldn't handle hundreds of zombies being rendered in real time in the game engine, the game would severely lag or crash. If the engine was suited to the Wii to have far less zombies on the screen at a time and perhaps make huge changes to the physics, it wouldn't be a fun game.