I don't think there's already a clone question, if there is I apologize but I didn't find it.
It's kinda of a spoiler but not really a spoiler.
So I'm using this strategy and I have 142 flags:
The thing is since flag #50 I'm not noticing changes in the behaviour of the AI. Basically I'm winning easy, I have just to restore the Pumpkin shield on the plants. I really don't care about doing 1000 flags so should I expect some increase in difficulty or is that it?
The version is Game of the Year.