Grid movement Terrain?

I'm making a grid based game ,and I want to add terrain in the game.The thing is ,I want to make some terrains easy to pass and some harder, like in many other turn based strategys (advance wars, ancient empires, mecho wars ,shadow zone), and I have no idea how to do that.

Here's what Ive done so far: http://www.hostmyfilez.com/v71b6rmlvocj/Grid.cap

Any ideas? Please, I need this game. Thanks in advance.

All you have to do is give the terrain a variable. Try the ghost shooter tutorial.

Variables are the first thing you should learn about when starting to make games in any programming environment.

All you have to do is give the terrain a variable. Try the ghost shooter tutorial.

Variables are the first thing you should learn about when starting to make games in any programming environment.

Yea I know, but if i make a value decrease when it concludes a terrain it will only affect one object and not the objects behind it. I know Im bad at explaining but never mind if you dont understand me I found a way to do what I want.Thanks anyway.