BUBSY GAMEBOY PROTOTYPE

i've been collecting  gameboy games for almost 2 years now, when we were at san jose, a man, probably in is 60's, was running a garage sale, then i found this cartridge, it had no label, just "BUBSY2" written on it from sharpie, when i loaded it, there were a lot of differences, the music is terrible, the egypt level is short, so is the sky level, but in the sky level, bubsy was not on the plane. it unknown whether this prototype is from accolade, or someone or something else, i showed it to some friends, before they experienced headaches and went missing.