Tip: Take advantage of easy to install Patches in your hack. The No More Sprite Tile Limits patch should be considered if you're encountering glitches where Mario and/or sprites are turning invisible.
A tool that automatically scans a ROM for free space, it will list both size and offset of a block of free space. It lists PC offset (what you put into a hex editor) and LoROM offset (what you enter into xkas for free space). Drag and drop a ROM file and it will generate a text file with the results.
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