Not to be confused with Super Mario Bros. 4 by Nico Corporation
Super Mario Bros. 4 is a game by NoName Corporation (referred in-game as Santiago) for the Nintendo Entertainment System. It is an remix of the original Super Mario Bros., with new levels and an WIP Bowser Jr. model, it is playable with an emulator, and available as a beta here (notice that some levels are still in development and some aren't modified from SMB 1): Download
Here, Mario is referred as Pizza & Luigi is referred as Fries (temporary names)
More info will be added here as it continues development.