Ok, here in Brazil back at the day all we had were pirated games. Guess most people know that. When my dad bought our MSX, we used a datacorder to load games from tape. 6 months and about 12 tapes full of games later, he bought a disk-drive.
I remember he used a program to copy the games from tape to disk... but there was one game he couldn't manage to copy. Maaaany years later I found out that game just can't be played from a floppy due to using some memory address which is also used by the floppy drive, or something like that.
I have some very weak memories of this game... I remember it was probably single screen, it had a black background and the screen was filled with balls (or bubbles?) which I remember moving around the screen, and you had to avoid or destroy them somehow. I don't think it was a Spectrum port and it was probably an early game.. our MSX manual had an 1986 manual and I am pretty sure that was the year it was bought... so I doubt this game was released any later than 1986
I know this isn't a lot of information... but the image of this game is like printed on my memory for decades, and I could never play it again.