Keyframes in 2.5

Hello, I am making a game that involves gravity shifts, I’ve created the keyframes for these shifts, but I can’t work out how to play the animation in game engine as the keyframes aren’t attatched to an object. any help on this would be great http://bafull.cgcookie.netdna-cdn.com/images/smilies/sago/biggrin.gif

the keyframes for gravity can’t be applied to an armature

Change the gravity via python:
http://www.blender.org/documentation/249PythonDoc/GE/GameLogic-module.html#setGravity

thanks i’ll try