For North America, PAL, and South Korea markets, Nintendo publishes the original NTSC-U versions, retaining their North American naming and 60 Hz support. The Japanese Family Computer variant is used in Japan and Hong Kong. Many games that originally supported local multiplayer now additionally support online multiplayer. Some NES and SNES games also have an alternative version labeled "SP" ("Extra" in some regions) which alters the game in some way, typically unlocking additional modes, starting the player with additional items or levels, or starting the player midway through the game.
