Nintendo announced Via their YouTube channel that the entire collection of NES games on Nintendo Switch Online will be getting a rewind feature on July 17. This can be used to rewind gameplay by pressing and holding ZL + ZR.
This will be helpful as there are various classic NES games on Nintendo Switch Online that are challenging where just one wrong button press can lead to a game over and have you starting the game over. Now though with the rewind function, by simply holding ZL + ZR you’ll be able to rewind that game over and continue playing the game as if it never happened. Look forward to the rewind feature when it becomes usable on July 17.