First go to Hu Lao Gate Stage and use Dian Wei. begin the stage on Cao
Cao's attack route and run past like 3 enemy platoons and have them
chase u till your out of range of any friendly troops that will take
your valuable K.O.'s and turn around and kill em continue this till u
get to hu lao gate u should have 400 to 600 kills  when u ram
your way through the gate kill Diao Chan and Li Jue so nothing is in
your way and dont go around killing gate captains cuz they'll bring
more troopz 2 kill finally when youve had your fill of kill go and
kick da crap out of the remaining gate capn's and finally Dong Zhuo