The difficulty doesn't change your odds of getting good/bad rolls. It changes how the computer opponent plays (risky or conservative). And @ kiwi, you need to get 3,000 points in a single round, not game.
To all the Flash CS3 whiners, you have two options:
1) Download the demo, and be able to use it for only 30 days.
2) Purchase the full version.
3) Find a hacked copy.
If you don't know where/how to get a hacked version, don't ask.