I've seen several ROM Hacks of Super Mario Bros. where the background tiles are animated, like in Super Mario Bros. 2 and 3. How can I do this? Are there any existing utilities or guides that can help me?
I've also considered downloading an existing ROM Hack that has animated backgrounds and working off of that, but the only ones I can find also alter the levels, the HUD, or Mario's physics. If anyone could point me to a Mario 1 Hack that only changes the tiles and/or makes them animated, that would be great!