Tetris v1.0 (Game Boy) May Have Been Released in the USA, Too.

[bigbacon]

explain this better?

if your game has the number on the left and made in japan on the bottom it is v1.0 and has different music?

EDIT:

I just looked this up for the music difference. My GB copy is as you say for 1.0 but it most certainly doesn't have the 1.0 song. copy came originally with my GB whenever we bought it way back when.