The elusive "negative secret grade"! The most I've completed so far is 13 rows, and here it is. Comments and feedback VERY appreciated on this particular video. This is definitely one of my proudest Tetris accomplishments :).
@crzy242: Hehe, it wasn't 2 hours nonstop because I played and resumed my progress a few times; but yeah, I definitely had to get my game face on for this one :D