Ninja Gaiden is an online NES game that you can play at Emulator Online. This free Nintendo game is the United States of America region version for the USA. Ninja Gaiden is a single title from the many skill games, fighting games and ninja gaiden games offered for this console. If you enjoyed playing this, then you can find similar games in the nes games category. Ninja Gaiden game is from the various retro games on the site, and there are more games like this, including Pokemon Greninja-Z, Sonic Gaiden and Teenage Mutant Ninja Turtles: Turtles in Time.