I dont understand how they make it to a real level that can be finished??

They play on the Japanese version of the game

it's a glitch. it wasn't supposed to happen, but people found a way to break the game. they found a new world that wasn't supposed to exist, one that could be finished.

I’m pretty sure he knows about the glitch but he wants to know what region it’s done because, USA was only a one level minus world but, Japan is three levels

Thats so unfair and sad :( I not have the japanese version :C :(

Or play on a emulator

@HUMANRAC3 depending of the emulator, no? In the Switch version is also imposible, I prove it

Actually yeah it does my bad.....but maybe with a famicom emulator? Cause if you look at the runners in the leaderboard, you can see that they have a famicom disk system

USA Minus World = NES Japanese Minus World(s) = FDS (Famicon Disk System)

@KilleDragon This means, it doesn't matter what you're playing on, as long as it can load a famicon version of the smb1 rom, you're good.

Thank you for clearing that out for me Nicky