sounds like the native orbit behaviour is what you're looking for :)
Thank you for the reply, but this isn't quite what I'm looking for. The 'orbit' behavior makes the object spin and doesn't let other objects cling to it. What I want is to have a floating circle in a platforming game where an object with the 'platformer' behaviour set (directional movements) can interact with it much like it would with an object with the 'solid' behaviour.
I almost need a circle of gravity around the floating circle to draw my main 'platformer' object towards it.