Defeat all the simulation enemies (Temjin, Viper II, Dorkas, Belgdor, Bal-Bas-Bow) with the same trooper.
Press Up+L+R on the Press Start Button screen, then choose Temjin.
Press X, Y, and Z at the same time during gameplay.
Hold Down on the D-pad and press L+R simultaneously on 'Press Start' screen.
Press Up+L+R on the Press Start Button screen, then choose Raiden.
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