: The Warp Zone in World 1-2 only leads to World 6, rather than giving you a choice between Worlds 2, 3, and 4.
When searching for “Super Mario Bros. NSP eShop full,” you may encounter: arcade archives vs super mario bros nspeshop full
No. Unlike on Wii or Wii U, Nintendo does not sell the original NES Super Mario Bros. as a standalone eShop purchase on Switch. The only "full" permanent version on the platform is the Arcade Archives release (Vs. Super Mario Bros.) or physical collections like Super Mario Bros. 35 (delisted). : The Warp Zone in World 1-2 only
: Includes CRT-style screen filters, scanline adjustments, and audio profiles to simulate original hardware. Unlike on Wii or Wii U, Nintendo does
"This version is available if you subscribe to the Nintendo Switch Online service," Ben noted. "You don't buy it individually; you get it as part of a library."
If you are looking for the authentic arcade experience of retro games, the Arcade Archives line is a gold standard for preservation. However, for Super Mario Bros. specifically, the official route is the Nintendo Switch Online service.