"Hello , ill make a clown of xyz but i donno if im allowed to do that. Am I ???"
Hey!
However, to the point of cloning games, hell, why not? If you like a game and you wanna clone it, jeez, go ahead... I mean, it's your own time that you spend, and for a hobbyist, game developement should be fun in the first place, right? So, if you have fun in cloning a game, I see no problem with that - if the question of copyright is cleared, of course.
