This game is also available on PS2.
At Hu Lao Gate as Lu Bu under Dong Zhuo under the hard difficulty setting, defeat Guan Yu, Zhang Fei, Liu Bei, and Gongsun Zhan. There will be a message that a supply unit has appeared to the northeast of the map. Defeat the Supply Captain and get the weapon box with the Sky Scorcher.
An easier way to get over 1000 KOs on Hu Lao Gate is play on the easy difficulty setting, then pay attention to the enemy gates. If you see a lot of enemy units pouring out, make sure to put your bodyguards on defense then stay near the gate opening. KO the enemies as they appear. Try not to KO the Gate Captain or no more units will appear. This is especially critical around the three gates in Dong Zhuo's fortress where you can accumulate over 450 KOs.
At the Opening menu, hold down the top right and top left buttons and select ''Replay'' to get the Neutral ending with Diao Chan singing.
Hold down the white and black buttons and select ''Replay'' to get the Neutral ending where Zhu Rong sings