This trick requires that you have the scope for your Silverballer. As soon as the level starts, run up the steps and to the right. Toss a bomb and quickly pick the lock on the first door on the left. Walk in and explode the bomb. Wait a moment, then snipe the man up in his private box and the actor walking on stage. Put your gun away and get out of there. If done correctly you will get a 'Silent Assassin' rank in under a minute.

When the mission starts, talk to the guard in the booth and get the WWI pistol. Go into the bathroom and wait for the worker to walk in. Sedate him and take his clothes. Hide him in the crate Walk out of the bathroom and to the right, where the man who is painting is located. Go through the door and down the stairs. Go through the double doors here then turn left. Go through another set of double doors. There should be a door in front of you. Go through it. It should lead to a dressing room for the actors. Go out the double doors in here then go to the left. You should reach a hallway. Go to the double doors to your left in the middle of the hallway. There are some stairs. Go to the right and go up them. Look for the beam where you can plant the bomb. Walk back downstairs and into the hallway again. There are two single doors to your left and right. Enter the first single door on your right. Wait in the closet for the man (who you originally swapped the gun with). Once he is in the room, sedate him and take his clothes. Wait for the bell to ring, which signals the beginning of the opera. This is the sound that plays once at the beginning of the level. Go out and wait for your target to get ahead of you. Once he is on stage, follow and stand close to the door while on the stage. Once he walks up the platform and stands in front of the pole, walk up and stand near the white 'X' on the floor, making sure to stand closer to the corner so that he does not get mad at you for being too close to him. You know how the opera plays out by watching the executioner shoot the prop at Alvaro D'alvade. When the music gets to the same point where the executioner shot him, shoot him wit h the real gun. Holster it. As soon as the music stops run off stage and back to the hallway where you entered before you got on stage. Wait for Richard Delahunt to show up on the side screen. Then, use the detonator. Make sure you are hidden when you do this. Once he is killed (which is confirmed by a check mark appearing above your screen), run back to the bathroom at the beginning. Get your suit back on and leave.

When you first enter the level, go to your left and wait for the receptionist to give you the WWI pistol. Then, stand by the bathroom to the right and wait for the worker to go in. Close the door behind you and use your syringe sedative on him. Take his clothes and dump him in a nearby container. Head out the door and make a right turn towards a door. Go down to the basement and move through the double doors. When one worker leaves and the other sips his wine, pick the lock on the door at the end of the room and go up the stairs. Open the door at the top and go down the hall until you see a door on your right. Go through it and make a left. You should see a door with a gold star on it. Go to your right and go into the door with the silver star on it. Make sure the guard does not see you. Once in the room, hide in the closet. It takes awhile, but eventually an actor comes in, says some lines, and leaves. When he goes, get out of the closet. Take the prop gun he left on the table and put down the real one. Get back in the closet. Wait for the actor to come back. He will take the gun, rehearse some more, then leave. Exit the room and go through the double doors almost directly across the hall. Keep going up the stairs and go through the doors at the top. When the worker leaves, plant an RU-AP mine on the machine in the center of the room and leave. Find your way back to the bathroom where you sedated the guard and take your suit. Go to the room where the opera is playing and wait. After several seconds, the actor fires the real gun you gave him and kills your first target. When everybody realizes what happened, your second target runs down the aisle to check on the condition of the dead target. In the middle of the aisle he falls. Detonate the RU-AP mine and the chandelier falls on him. Exit the level to get a Silent Assassin rank.