Super Mario Advance 2 was my first experience with Super Mario World, so I hold it very dear to my heart. Of all the Advance-series ports, it's probably the least amazing in terms of new content. However, that doesn't mean it doesn't have new content. One of the neater additions is a status screen that pulls up on the overworld, which shows your progress in various worlds. Specifically: which levels you've unlocked, which ones you've completed, and which ones you collected all the Yoshi coins for, in addition to general information like score and time passed. Pretty useful, especially when you complete all the exits because then you're able to warp to any level simply by selecting it.
One time on CaffieNET (#smwc or #serioushax, not sure which since I no longer have logs of the time), the one and only Adam suggested that someone port this status screen to Super Mario World. I, being a rather compulsive idiot, jumped at the opportunity.
