Well, there's definitely some that aren't perfect. But how many and which? That's for guys like you to find out.

There are professional "cashers" that have figured out how to hack a small percentile of games in MA. They take advantage of a few things, but if you have $100k you are guaranteed to make a profit. Source: http://www.wired.com/wiredscience/2011/07/broken-lotteries/

Now this guy is a trained statistician from MIT and Stanford and has put math behind it. He figured out the tic tac toe game. Source: http://www.wired.com/magazine/2011/01/ff_lottery/all/1

So as you can see all games aren't entirely fool proof. Good luck!