Super BlueYoshi Kart EXPERT 1.1 is likely a more challenging variation of Super BlueYoshi Kart 1.1. This ROM hack likely increases the difficulty by tweaking aspects such as AI opponent behavior, track layouts or item distribution, providing a more demanding kart racing experience for seasoned players. It shares a similar origin within the ROM hacking community with independent developers creating and sharing their modifications. 

Super BlueYoshi Kart EXPERT 1.1

Super Black Bass 3 (Japan)