Rockman ZX Prequel – a fan-game set 200 years before the events of Rockman ZX – quickly become a favorite among Chinese-speaking Mega Man communities. Unique to ZX Prequel, though, is a light/dark world system. In the light world, you'll occasionally run into virus-infected mechaniloids. However, in the dark world, ALL enemies will be infected. Light or dark, enemies infected with the virus are said to be stronger than the norm. A gauge at the top of the screen shows you just how bad the outbreak is in your current position.