from the acheivement list for TE think maybe a developer passed by your ytmd, tepples? heh. there's some other interesting acheivements, too. i see marathon, cascade, ultra (1 minute?), race (40 lines?), score (10 minutes?), hotline, eraser, and go low. also, there seems to be a "fill rate," which one can set to "high" in cascade.
There are two different YTMND pages, which discuss two "infamous" aspects of the SRS ruleset: Tetris is ridin' spinnaz by tepples, which sets Infinity to rap music EPIC TETRIS MANEUVER 2.0 by thetoad, which sets the (-1, -2) movement of 3-cell-wide tetrominoes in SRS to stereotypical epic music