Ben 10: Protector of the Earth is an online NDS game that you can play at Emulator Online. This free Nintendo DS game is the United States of America region version for the USA. Ben 10: Protector of the Earth is a single title from the many arcade games, anime games and action games offered for this console. If you enjoyed playing this, then you can find similar games in the nds games category. Ben 10: Protector of the Earth game is from the various retro games on the site, and there are more games like this, including Ben 10 Ultimate Alien: Cosmic Destruction, Ben 10: Omniverse and EarthBound.