I blame this on long flights to Asia, but my high score is 3,174,470.
The key to the game is to stratigically build up a big pile of WITHOUT exploding anything then dropping one that basically blows the whole thing apart. You can get the points multiplier into x9, then basically blow up a bunch of stuff to keep the points multiplier high. Once it gets to x3 or so, REPEAT, start building up a pile and avoid blowing anything up until you're filled the screen.
