Use the following steps to complete the game.

Level one: Shoot the second person wearing a hat.
Level two: Wait until you see a plane with China airlines. Shoot the first person coming of that plane.
Level three: Look at the person at the computer. A guard will also come close after the guard walks away. Shoot at the computer person.
Level four: Shoot the seventh person coming out of the jail house.
Level five: Shoot all of the guards. Four will be on the high place. Then shoot the person with a gun on the first floor. You will see part of a head sticking out the crates at the bottom left; kill him first. Kill the people in cars.
Level six: Kill the guard on the top right first, then kill all of the guards. There will be a guard in the middle walking in the far back; kill him. Then, kill all of the workers.