CubeStorm Sprint 40 Lines
10 Tetrises in less than a minute without using hold ;)
CubeStorm features a "2.5D Rotation System" where pieces can be rotated 180° around the x-axis and y-axis in addition to the usual z-axis 90° rotations.
Tweak display settings to increase performance.
Imagine what a player with serious skills could achieve :)