Super Mario World DX

Super Mario World DX is a fan-made colorization or enhancement hack based on Nintendo's Super Mario World, catalogued here for MS-DOS with a listed year of 2002. Projects carrying the DX suffix typically rework an existing game with new palettes, graphics or tweaks, and this appears to be a community edit built on the classic Mario platformer rather than an official Nintendo product.

Because it's an unofficial hack, its precise contents depend on whoever created it, so beyond its Mario platforming heritage I can't describe specific changes without guessing. The source material it draws on is one of the most acclaimed side-scrollers ever made, so the underlying jump-and-run appeal is well established, but this particular version is best approached as a fan curiosity.