Kingdom Rush

[Xmann]

OK folks, I rarely ask for help in beating a game....... but i am truely stuck and need help.

I have beaten all the regular maps in kingdom rush, but I have been trying for weeks and weeks to beat the last 3 extra red flag maps and I just can't. I've tried with every combo I can think of, including using a hero and I can't do it.

So for anyone that has beaten it, can I get some hint/ tips?

Sent from me phone