Since I am, pretty much, a beginner game programmer, I decided to test my skills by cloning the "Clock Puzzle" minigame featured in Final Fantasy XIII-2. If I upload the clone a created to gamedev to get some feedback, would that be considered illegal (a violation of copyright or some law)? How can I check if a clone i create will violate copyright/law?

Note: I don't know if this matters but I did not use any assets from the original.

Thanks in advance.

You're allowed to copy game mechanics, just not to use or copy any assets, or to use any of the distinctive names from the original. So your upload will probably be fine.

Thanks for your quick response, I will upload it.