Hey... say I were to make something like a breakout game where I'd need to detect when a ball or something hit a block. Would it be more efficient to script it so that every frame, the ball checks (action script in the ball object) if it's touching any blocks (does a loop for all of the blocks and checks how close it is to each), or to put action scripts in the blocks themselves to check if the ball touches them, then tell target the ball and make it change direction then remove themselves, or have all of the code in the "root" of the movie. Maybe another way I didn't think of? I'm not sure how much of a difference it will make depending on the way I do it. Any tips would be appreciated. Thanks.