Although I haven’t played The Lost Levels.
This is a custom-made level by the Nintendo Treehouse in Super Mario Maker, a game that lets you make your own Super Mario Bros. levels in several different styles. As part of the last challenge of the Nintendo World Championships, each contestant had to beat a succession of custom levels in order to be crowned the Nintendo World Champion. John Numbers, the guy who beat this level, ended up getting it. It was an awesome event and a great way to start off E3. I hope Nintendo’s digital event today is as good!