the arrow label worth nothing, it is only for decorative purposes.

and the initial rotation of the object sets the initial direction of the gravity concerned.

hmmm... didn't fully understand. I created polygonal object. Then i created lable as arrow and set it red. I see that I can moving red dot. But I cannot set this arrow label as gravity maker...(

@samvkahn: error on the text ? erm ... maybe a french character like 'é' ... anyway it's not modify the gameplay.

@DoubleMike: i wanted to use this this property like in the level "08 : connection"
how can you make it ? it's simple ;)
first select the triangular goal... see the 3 coloured lines , OK ? Now, did you notice there was three coloured dots ?
While making this level my level, i clicked on the red dot attached to the goal, and clicked on the black object, and a small red circle appeared in the center of this one.

I got an error on the text

Very Cool! Interesting...how have you done moving object (near the end) which changes gravity)