So allow me to break down how you can effectively make something look 3D, So alot of people know the further something is; the smaller it gets and this also effects how much it will move based on your perspective. People knowing this will make the front and BG two seperate things, which is neat. but to really sell that feeling, you should try to make multiple layers. The first sonic Games actually used this trick to make a 2D Game look 3D.
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