How to have an invisible boundary

I want to make a game that you draw a line and roll a ball down, how do you make it so you cant draw the line any further? but the boll can still roll down?
Thanks.

Can you give some more details, please?

Is the boundary only on Y or X, or is it like a box?

Also, is the line straight?

Peach :)

views:2145 update：2011/9/20 17:36:54

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