The Legend of Super Mario: Save Mushroom Kingdom
The Legend of Super Mario: Save Mushroom Kingdom is a hack for the NES.
About this hack
The Legend of Super Mario: Save Mushroom Kingdom is a hack for the NES. In short, it adds or improves saving. The full list of changes, the credits and the instructions are on the creators' page.
Playing it
The patch is applied to your own copy of the original game, following the creators' instructions. The game itself is not included and is never linked here.