Nintendo Entertainment System - Nintendo Switch Online

Nintendo Entertainment System - Nintendo Switch Online (known as Family Computer - Nintendo Switch Online in Japanese and Chinese) is an application for the Nintendo Switch system. It features a library of Nintendo Entertainment System games, with some supporting online multiplayer, and some games having "special" versions, with players given advantages and/or skipped ahead to later levels. It was released at the launch of the Nintendo Switch Online service in North America on September 18, 2018 and in Japan, Europe and Australia on September 19, and later in Hong Kong and South Korea on April 23, 2019.

The application is exclusive to active subscribers of Nintendo Switch Online; users can access these games as long as they have an active subscription, and must connect to the internet at least once a week to continue to access them offline.

Button mapping
If a Nintendo Entertainment System Controller for the Nintendo Switch is connected, the main menu's sound effects are replaced by those from Super Mario Bros. and Super Mario Bros. 3.

List of Super Mario games
The following Super Mario games are available on Nintendo Entertainment System - Nintendo Switch Online in all regions. Titles written in bold are special (SP) versions of existing games.