Getting scores that high involve huge chain reactions, great timing with the music, and the previously mentioned power up icons. (gamerstemple.com)
In terms of gameplay, it's fairly straightforward stuff - shoot matching bubbles at the bubbles above to create huge chains and clear the screen, earning points as you go. (pocketgamer.biz)
Harrison's model can explain features of the Universe that have stumped cos - mologists, such as huge chains of galaxies that stretch for hundreds of millions of light years. (newscientist.com)