Devil May Cry 4/Porte de L'Enfer

Opera House Exterior
The cutscene shows demons attacks citizens of the town in the plaza. Credo leads them to a gate and leaves Nero to kill the demons. There is not much in this area, just kill of the scarecrows and move on. Red orbs are contained in the benches, smash as many as possible. The door to the storeroom is at the end near the floating red orb. You will recieve a tutorial if they are turned on.

Storehouse
As soon as you enter this room there is an oppitunity to gain a precious gold orb. It is in a small hole in the wall at the top of the small steps. Just climb the wall to get it. After this climb the main stairs to the upper floor. In this room three scarecrows will ambush you and they must be killed to proceed. Red orbs are hidden inside all of the boxes and shelving units.

Business District
Nothing to do here. There is a small army of scarecrows smashing up the city below but there is nothing to do about this (for now anyway). Enter the Cathredral through the door on the left.

Cathedral
Head to the lower section of this building. Down there there are some chairs that can be smashed for red orbs and the Evil Legacy skull, granting the ability to use Snatch and Grim Grips. After picking this uo go up a floor. There is a Vitality Star S in one of the sections, snatch it with the devil bringer to pick it up. There is a green orb on the otherside if you need health. Follow the grim grips to the exit, being sure to smash all of the benches along the way. There is also a large red orb on the left at the exit, obtainable by snatching it. You can jump across to get it but then you fall back down to the bottom of the Cathedral.

Business District, Terrace
You can now grapple across the street to the other side. Over here is the entrance to the first secret mission ,Annilation. Past here is a section where you will be ambushed by two scarecrows. Dispatch these and grapple across the street and there are more scarecrows to be killed. Through the door is the entrance to the Residential District.

Residential District
Drop down here go round the corner. On Son of Sparda or higher there will be assualts or scarecrows if the difficulty is set lower. The boxes contain red orbs and there is a gigantic one in the upper area. Just past this there is a way up to the rooftops. Follow the red orb trail to a blue orb fragment. After collecting that jump down to ground. There are some orbs in the bins, this section keads to the Port.

Port Caerula
Thge way forward is blocked because the bridge is up. To lower it you need to grim grip across the port and into the customs house. There are a few scarecrows in here, after defeating them activate the switch and smash the blue web. Hop up the stairs and through the door at the top. In this bit hit the switch to lower the bridge. Then backtrack to the bridge and cross it into the next area. This time there are two groups of scarecrows blocking the way, one outside the customs house the other just before the bridge.

First Mining Area
In the trench at the end of this room is six red orbs. Grip up to the upper level and there is a blue combat adjudicator, requiring a C rank to beat. This holds a blue orb fragment. There is also a divinity statue by the door, so buy vitality stars and power up before the next section, the Ferrum Hills.

Boss Fight: Berial
The flaming giant Berial is in this section. He can destroy the wooden shacks so do not hide behind them. Attacking his head is the best course of action until the flames go out, then bustering him until he dies. When he reignites back off as the attack reaches quite far. Not particularly challenging, except on Hell or Hell mode.

Post-Berial
Not anything major left to do. Just go up the stairs behind where the red web was and into the tunnel to end the level.