I don't think you put in a code for brawl ball. You accidentally put in a code for a showdown map. But in terms of the showdown map, its ok, though maybe add a little grass between and around the outer stone island blocks.
So sorry, I accidentally didn't copy the old one, and instead put in somebody else's which was showdown I was playing with. It doesn't seem you can go back to a published map to edit/ get the code so I deleted the post.
Brawl Brall doesnt have any game logic yet. Perhaps that will be added in the future, but for now you'll have to enjoy just running around by yourself!