It depends, making tetris is the fastest way to increase score. but you can't always do it because you might have a well 3 piece deep somewhere, where if you don't fill that, it limits your stacking options for other pieces.
The other problem is, at the high gravity, there might be a lip next to your well, which would block the line, so you have to build up to flat first or use it somewhere else.
Then there's endurance management, at around 5 million points, it's already 1.5-2 hours in, you have to pace yourself and build in such a way that is not ideal, because you're too tired. This is different than tetris on supernintendo, or super gameboy, where you have a big screen, and you can see from far away and a big controller, on gameboy you're hunched over, your back hurts, you're squinting, and eyes very close to the screen.
