Hey, it's Bart vs. the World for the Game Gear, or as it was known in Japan, Bart World.
A former Santos programmer said they converted this and Space Mutants from the Master System to the Game Gear. I don't understand why they needed a Japanese company to do that. (The Master System versions were developed by a British company called Arc Developments).
Audio production company T's Music lists the game on their website; I don't know what they would've done. The site has any number of mistakes, but I believe this was the only version of Bart World released in Japan.