This version of Tetris likely has my most amount of hours on it as well, I played so much of it on my DS back in the day. Absolutely fantastic.

My runner up in terms of hours is probably Puyo Tetris.

Just a minor correction as I live in the area as well, Spring is the closest direct suburb of Houston which is anything but small town. Not excusing it of associated problems of being a relatively affluent/gentrified area in Texas, of course.

Reading through this thread, this guy is nuts though. That's a special brand of crazy.

I have a soft spot for Twist as well, it's a delightful little gimmick for Bejeweled. The music in that game specifically is surprisingly catchy, too.