While the gameplay remains unchanged for all of the classic titles offered for the Virtual Console, Nintendo has stated that some games may be improved with sharper graphics or better frame rates. In reality, however, many games suffer from drops in frame rate or have graphical glitches not present in the original, and many PAL SNES games run with significantly reduced borders compared to the original cartridge releases. As with disc-based games, the Virtual Console service is region-locked—that is, different versions of games are provided to different regions, and game availability may vary from region to region.