I recently decided to subscribe to Nintendo Switch Online, so I can play the NES games included in the service.
When I launched the NES Nintendo Switch Online app, I noticed that some games were listed twice, such as Metroid, The Legend of Zelda, Ninja Gaiden, and more. The duplicate appears to have a "SP Special" logo on top of the game's cover art.
But what exactly does the "SP" do? What's the difference between SP and non-SP?