It's fun to make something deliberately wrong that still is a high enough % correct to win. On level 4 instead of making a green circle/x combo, I made a green piece of bacon.
Getting the 30x combo is made much harder by flash's tendency to freeze for a split second on occasion. When this happens, the game thinks you haven't been doing anything and ends your combo.
Episode III isn't fun at all. You don't get any time to look at the enemies; instead you have to figure it out by losing repeatedly. And then you have to wait more time than you spent playing for it to load again.
It's difficult alright. But why is it difficult?
1. The tiny pictures are hard to see, yet extreme precision is still required.
2. The backgrounds muck up the screen making it hard to see what's important.
3. The control scheme is based on acceleration which means you'll end up pushing the left and right arrow keys in a complex sequence trying to get to the right position.
These three things combine to make one ugly challenge.
 "Humbug"){kind=icon}
 "Tyrant"){kind=icon}
 "Copy Cat"){kind=icon}
 "Warzone tower defense"){kind=icon}
 "Get Off My Lawn"){kind=icon}
 "Zening"){kind=icon}
 "Frantic"){kind=icon}
 "Meat Boy"){kind=icon}
 "Blocks With Letters On"){kind=icon}
 "light-Bot"){kind=icon}
 "Chronotron"){kind=icon}
 "Smileys-War"){kind=icon}