Gravity volume that effects an object ( ball ) in a specific area

I need the gravity changed in one small part of the map to objects in that specific area * not the effect the gravity has on a player*
I have tryed making that part of the map a new level and everyting els i can think off.
But the only way i can make an object be effected by a different gravity is by adjusting world gravity * effecting both player and objects ) and then making an exception for player gravity. this solution screwss up the rest of my game.
Any one know how to make someting like a local gravity ( or have an abject like a ball have a different gravity ) ?