Well if you make a re-make you may or may not be asked to get rid of it depending on who holds the copyright and how funny they are about it. Basically unless the game has been totally released by the author or publisher as public domain then it's still copyright and you should be careful. Certain you can never resell a remake unless you obtain the rights from the original authror/publisher. As for cloning the gameplay, well that's not so bad IF you change all the graphics and sounds (and level layouts). If the graphics and sounds are too similar, you have copyright issues again. That's what I think anyway.
Remake copyrights
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