Online Play – Battle it out or cooperate with players online in compatible games like Splatoon 2, ARMS, Mario Kart 8 Deluxe, Mario Tennis Aces, and Super Smash Bros. UltimateNintendo Entertainment System - Nintendo Switch Online – Enjoy a selection of classic NES games with newly added online play. You can compete (or cooperate) online with friends, share your screen, or virtually pass the controller, depending on the game. With the Nintendo Switch Online smartphone app, you can also voice chat during your play sessions.Save Data Cloud – Back up your game save data to the cloud. This makes it easy to retrieve your game data if you lose your system or start using a new one.Smartphone app – Enhance your online experience with the Nintendo Switch Online app. For example, you can use voice chat with players in compatible games. In addition, the app gives Splatoon 2 players access to SplatNet 2, where players can review and share their battle statistics, order gear for use in-game, and enjoy other features that make the game even more fun.