I've seen so many cool hack for original NES Super Mario Bros, but it seems there are litterally no one talked/mentioned the unpopular arcade version (Vs.Super Mario Bros). This arcade version is much harder and also has top ranking screen as well. It comes to my attention about this little known game as it was made available for Nintendo Switch. I've researched abit and it seems the VS. Super Mario Bros ran on an arcade board called VS.Unisystem which uses the same CPU and slightly different PPU but structure wise, it's pretty much an NES.
Would love to see more hack/mod available for this gem as it's deserved to get some attention from the community