Name confusion : The three names for the game come from the different region releases.
US - Bad Dudes
Europe - Bad Dudes vs. Dragon Ninja
Japan - Dragon Ninja
 Important information related to this game : The retail release of Dragon Ninja has a bug which forbids the player to jump far enough between the truck trailer wagons. This bug has been fixed by Ocean France in the version 2, which has been sold in the compilation 'Les Justiciers'.
 Distributed in Italy by Leader.
Based on 1988 Data East coin-op BAD DUDES VS. DRAGON NINJA.
PC versions: CGA?, EGA?, VGA
When ever you want or need more lives press ‘LEFT ALT’ and type “IMAGINE”. Then press ‘RETURN’. This will give you an extra life. You can have up to four guys at one time.
This next one I couldn’t get to work, but it may work on other versions.
During the game, type “TERRIFIC” and press ‘L’ to skip levels and ‘F3’ gives you infinite lives.