To fix pixelated 2D backgrounds and tiles, you must enable custom texture loading.
: High-definition textures for ground blocks, pipes, and background elements remove the pixelated shimmer when upscaled on a PC or large monitor. new super mario bros ds hd textures
This is a grey area. Downloading a ROM of a game you do not own is illegal. However, because they are original fan art or AI upscales of publicly available assets—they contain no copyrighted game code. To fix pixelated 2D backgrounds and tiles, you