I wouldn't suggest using a packet bot, those things are a thing of the past (highly detectable)
Code:
World = s
> getActivity = s.d
> getDomain = s.i
> getIndex = s.m (-781463647)
> getLocation = s.q (122560199)
> getMask = s.x (-485706191)
> getPopulation = s.k (-1825444877)
> getWorldID = s.n (-1049303969)
@Summary(7/7 Fields : 0/0 Methods)
% changeGameState(II)V = i.e (-1398873718)
% setCurrentWorld(Ls;I)V = fp.o (2079200391)
> getGameState = client.c (346046433)
Obviously when setting the mask and id of the world object you make you will have to mod inverse the multi first and then multiply your value by it to set the field. The rest is straight forward I beleive