Yes, there is a flash game The World's Hardest Game and its creators claim that it is the most difficult game in the world! And I'm with them, perhaps, I agree as to complete the game is very difficult, without all sorts of guides and tips. According to statistics, only 2% of people without help can go through all levels of the game to the end, and not a few levels.
What is the essence of the game? It's all very simple, even though the game has established itself as the most difficult game in the world, but the task in the game is simple: the arrow keys to advance the red square over the obstacles, collect coins and go to the next level.