Ok, I going to help you a bit more:
Lets say what do you want your object to do?
Your behaviour is something like this
Are we moving down?
{
Move down
If we are above 200, you want to make it move up. (Hint: State Change)
}
else{
Move Up
If we are below 0, you want to make it move Down. (Hint: State Change)
}

Find content
Not Telling
