Scratch

Since I have been using the program for less than 24 hours, take what I say with a grain of salt; but, couldn't you do something like "If not touching =color=" move 5 steps" 

That way if your sprite is not touching the color it can move, if it is, then you can't.

Although now that I think about it, then you would never be able to move off of said obstacle.

Hmmmmmm.

You could fix that by creating a string under the first that says, "If touching =color=, turn 180 degrees, move 1 step.

That would solve the being stuck on the obstacle.

Again, I don't know what I am talking about.

Good luck.

Thanks!