Secret Mission, Combat Adjudicators and Blue Orbs
Mission 3: The Devils Tower
13th Avenue: Upper platform on the right of the screen.

13th Avenue: Combat Adjudicator for the Rebellion on the platform left of the screen.

13th Avenue: Secret Mission 1 "The Exorcist". The door on the right side of the screen just after the garbage collector. Objective: Kill everyone within the time limit.
Mission 4: The Unwanted One
Incandescent Space: Above the door which leads back to the Chamber of Echoes.
Mission 5: Of Devils and Swords
Endless Infernum: The Combat Adjudicator for Cerberus across of the room to Gigapede (the one where the stairs fall off, and you drop into the Chamber of Sins).

Surge of Fortunas: Secret Mission 2 "Untouchable". The red structure next to the circular seal. Kill everyone without being hit.
Mission 6: Family Ties
The Dark Corridor: Combat Adjudicator for Agni & Rudra next to the blue door.
Mission 7: A Chance Meeting
The Dark Corridor: Secret Mission 3 "Death from Above". The red structure in a hole on the right of the brown door. Stay in the air for 20 seconds.

Pitch-Black Void: Head to the stairs leading to the blue door. At the horizontal beams area above the stairs. It's floating somewhere above the middle beam.

Lift Room: Combat Adjudicator for the Rebellion.
Mission 8: A Renewed Fear
Leviathan's Stomach: On the ship.

Leviathan's Stomach: Secret Mission 4 "Devil's Teeter-Totter". Jump off the ship. Destroy the barriers on the bottom left of the ship and examine the blue structure behind. Avoid overweighing the elevator to get it to the top.

Leviathan's Intestines: After obtaining the Ignis Fatuus item in the Leviathan's Retina, head on to Leviathan's Intestines. Stay on the left along the path. You will notice a small pathway on  the left, which leads to a Combat Adjudicator for Cerberus.
Mission 9: Faded Memories
Subterranean Garden: Above the Divinity Statue. You'll need to use Trickster and Air Hike.

Limestone Cavern: Secret Mission 5 "Destroyer". After going through the waterfall, keep an eye out on the right side of the path. You will notice a small passage hole, which leads to a pair of crystal-like structures. Examine them to enter the Secret Mission. Destroy all 50 breakable items.

Subterranean Lake: Combat Adjudicator for Nevan before the waterfall after the Divinity Statue. Available during the next few missions for when you actually OBTAIN Nevan.
Mission 10: The Job
Subterranean Lake: Secret Mission 6 "Flight of the Demon". After using the Stone Mask to raise the bridge, cross the bridge to reach a giant statue. Examine the blue skull on the back right of the statue. Collect all 40 orbs within the time limit.
Mission 11: Revenge
Gears of Madness : Secret Mission 7 "Hang 10". Before reaching the yellow door at the end of this area. You will notice a ledge somewhere at the left of the yellow door. Jump onto the ledge then Air Hike onto the platform above it. Examine the red seal there. Obtain the Blue Orb Fragment within the time limit.

Altar Of Evil Pathway: Above you, at the entrance. Use the pipe lines to  reach it.

Temperance Wagon: Combat Adjudicator for Agni & Rudra. Beneath the stairs that you came from.
Mission 13: Chaos' Warm Welcome
Spiral Staircase: Secret Mission 8 "Tough Guys". Examine the red light on the wall. Kill all the enemies.

Obsidian Path: Combat Adjudicator for Nevan.
Mission 14: Drive
Lair of Judgment Ruins: Combat Adjudicator for Beowulf.

Vertibule: Secret Mission 9 "Target Practise". When you reach an area with blue flame stands on both sides of the pathway, Wall Hike above the left blue flame to enter a crack in the wall. Examine the blue light in the crack. Do not let even one enemy escape.

Hell's Highway: After defeating all the Damned Chess Pieces, go through the last gate and grab the Blue Orb Fragment.
Mission 15: The Gatecrasher
Underground Arena: At the Top Subterria Lock area, hit the dial TWICE which is attached to the statue. Make sure that it rotates TWICE! The colours on the dial with "pie" like segments should be in the order as stated below:
a) Top-Left segment Red.
b) Top-Right segment Purple.
c) Bottom segment Blue.
Then go through the door on the left of the statue. You will enter the Marble Throughway. Just go foward through the rooms, which are the Devilsprout Lift and then the Spiral Corridor. You will then reach the Underground Arena. From there, just jump down to ground level. The Blue Orb Fragment is located somewhere around this area.
Mission 16: Win or Lose
Waking Sun Chamber: Secret Mission 10 "Guiding Light". The door on the right of the Golden Sun Altar. Solve the Crystal Puzzle.
Mission 17: Inner Demons
Azure Garden: A Blue Orb Fragment can be found in a small room on the left of this area.

God-Cube Chamber: Combat Adjudicator for Beowulf. On the right end on the ground of the God-Cube Chamber.

Pitch-Black Void: Secret Mission 11 "On Pins and Needles". Head up the stairs leading to the door (the corridor on the left). At the middle horizontal beam above the stairs. Examine the statue on the right (the one which has light). Avoid the Spikes and obtain the blue orb located at the end of the area.
Mission 18: Invading Hell
Road to Despair: Secret Mission 12 "The Final Ascension". Before entering the mirror to the next area. Go to the back left of the big foot statue. Examine the wall. Obtain the Blue Orb Fragment on the top level.

Lost Souls Nirvana: Defeat all the bosses.
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