The Nintendo Switch Online Expansion Pack is an additional paid tier to the standard Nintendo Switch Online service. It was released on October 25, 2021, and includes Nintendo 64, Sega Genesis, and Game Boy Advance games in its library. It also includes access to paid DLC for Animal Crossing: New Horizons, Mario Kart 8 Deluxe, and Splatoon 2. The Expansion Pack can be added to subscriptions by existing members, with a "pro-rated discount depending on the number of days remaining in your current membership". The prices for new customers taking the combined Nintendo Switch Online + Expansion Pack are $49.99 USD for a 12-month membership or $79.99 USD for an annual family membership (up to 8 users) . The benefits of the Expansion Pack include access to a selection of Nintendo 64 and Sega Genesis games, as well as the Animal Crossing: New Horizons - Happy Home Paradise and Mario Kart 8 Deluxe - Booster Course Pass DLCs at no additional cost.