Possible Duplicates:
How closely can a game resemble another game without legal problems
Legal issues for a "fangame" of a commercial franchise?
I want to do a mobile version of an old game I used to like called Bow And Arrow (video, game). There's a project already port it in Ruby. I'm wondering if I can do a remake of this game. Do I have to get permission from the creator, or does it only matter if I use the same resources (graphics and sound)?