After getting Ultra Gold Medal, this one is a breeze! I kept the basic setup for this one, just as the other:
Mode: Score
Target: 25000
Start Level: 1
Fill Start 8
Fill Rate Medium
Goal System: Fixed
Lockdown: Infinite
Basically, I built for back-to-back Tetrises, always saving the skinny piece, always pressing down on the d-pad to drop faster with points. I had 14 in a row until I messed up, cleared 3 or 4 lines and then it popped. Hope this helps everyone! :)