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.
Mostly google translate (heck, even the very 1st post. how ironic) + chatter here and there = bad. If it was really needed, a Japanese would start a help-me-hack-supamariowarudo thread.