Uhh if they had a top that you had to circle around the digimon then i might be scared but Digimon World DS is nothing like Ranger. Its based off the Digimon World 1,2 and 3 games for Playstation. Please get your facts straight before making yourself look like an idiot.
If you actually read [if you're capable of doing so, which I doubt] anything about the games, you'd know that they were totally different. Digimon World DS is, funnily enough, modelled on the fairly popular, Digimon World game for the Playstation which was released in 2000. Are they copying a game released six years after the concepts birth?
Are Digimon games not allowed to be on the DS platform? Because that's all that the two games have in common. Would you rather that Pokemon games were the only games to be published, on any platform? That's called a monopoly, and it's illegal you moron.