This is not actually a Double Dragon 4. It is a little hack for the game called Target Renegade. The author of the hack simply changed the title screen image a little bit and plot text in the start of the game. But yeah, i was thinking that this is Double Dragon 4 too, when i was a kid. And it even looks like Double Dragon 1, when it's not. But yeah, the soundtrack rocks hard. Especially the main theme.