I forgot that there aren't any Cherries in the Shadow World, my fault (haven't played the game in long time).
Forget what i wrote about the Blue Coins.
Edit: I watched some gameplay on YouTube to get my memories of the cherry/coin system of SMB2 back.
Like i said earlier, this Hack would be nice if the Cherries are replaced by Coins and the Black Cherries in the Shadow World by Red Coins (if possible), make the Red Coins count toward the Bonus Game and not the Coins you grab from the ground. I would remove the Coins you get from the ground but its all up to you.