Nintendo has expanded its Nintendo Switch Online offering with N64 and SEGA Mega Drive games, or SEGA Genesis games as they are known in North America. Nintendo has recreated classic controllers for both systems that run to US$49.99 each. N64 and Mega Drive games will only be playable once you pay for the Nintendo Switch Online Expansion Pack, a second monthly subscription for Nintendo's online platform.
https://www.notebookcheck.net/Nintendo-returns-to-the-N64-and-SEGA-Mega-Drive-for-its-Nintendo-Switch-Online-Expansion-Pack.564602.0.html