/vr/ - Retro Games

>>4993736
I think they did that to make it look more detailed, more "next gen".

You don't need a great computer to hack a Megadrive game.

However the task might be a little more complicated than you think, but it all depends on how the game handles its sprites and whether or not you can find tools/documentation to help, look on romhacking.net for graphical tools. At least you're going from bigger to smaller, the contrary could prove to be a little more difficult.
Your best bet is probably to use an NES sprite sheet as a base. Keeping some of the details like shadows will be impossible at times