There are several patterns that once memorized make it easier to play. But it will sometimes throw in
a variation of certain patterns to make it more difficult.
The first and easiest pattern is the one where it just goes back and forth across the whole screen.
Another pattern is when it drops two, goes to the right drops two, goes back to the left drops two for about 4 to 6 times. There are many variations on this pattern some easier, some more difficult.
There are more but I find them too difficult to explain.
Keep trying really hard and you'll figure out how to play level 8. It took me a few days to be able to play it and it took a few weeks until I was able to get a score above 150,000.