A huge thank you to Yorien from a thread on GameFAQs[www.gamefaqs.com] for finding and documenting the vast majority of these secrets.

In order to see a secret wall/door, you must either:

• Have a hireling in the party, which is capable of detecting secrets:
  Rosalie - found at the Chapel of Elrath in Soprpigal-by-the-Sea (10,13)
  Quest NPC, detect traps, secret doors and enemies
  Spike - found in Yon-Chall Forest on Agyn Peninsula (59,72)
  Quest NPC, detects secret doors, decrease the difficulty opening them by 25%
  
• Have an active spell Whispering Shadows (Dark, Novice)

If you have party banter enabled, one of your characters will say "What's this?" when you are 1 step away from the secret wall/door.

In order to open a secret door, face it and press the USE button. The game will prompt you to select a character with whom you'd like to try to open the door. Depending on the symbol outlined on the wall, a different attribute is needed to open it:

• Crack = Might
  
• Gears = Perception
  
• Key Hole = Magic

Pick the character specializing in the required attribute and you should be able to open the secret. If the attribute value is not high enough, the character will take a large amount of damage that cannot be resisted. If this happens, there a couple of options to temporarily buff your attributes:

• Spells
  - Inner Fire (Fire, Expert) - Might
  - Eagle Eye (Air, Expert) - Perception
  
• Well Rested - 10% bonus to all attributes
  - Sleep at an inn
  - Rest with Kengi as a hireling - found at the Goblin Watchtower in Sorpigal-by-the-Sea (16,14)
  
• Hour of Power - (+X to Might, Magic, Perception, Destiny)
  - As a blessing at a Maiden Statue (+10)
  - As a spell (Prime, Grand Master)
  
• Equipment - shuffle equipment around to buff a single character

All of the above effects stack, so if you're struggling, try to get as many as possible before trying again.

Main Level

• (6,5) MIGHT - Chest, missing citizen

Level 1

• (3,1) PERCEPTION - Chest

Level 3

• (5,5) MIGHT - Chest

Level 1

• (4,6) MAGIC - Lever to (3,2) Chest
  
• (10,6) PERCEPTION - Chest
  
• (7,2) MIGHT - Stairs to Level 2

Level 1

• (11,0) MAGIC - Chest

Level 2

• (1,8) MIGHT - Chest, Key
  -- heavily guarded

Level 2

• (7,15) MAGIC - Berenice (Magical Focus GM Trainer)
  
• (5,12) PERCEPTION - Chest
  
• (16,7) MIGHT - Chest

Level 1

• (29,7) MIGHT - Chest

Level 2

• (6,19) MAGIC - Chest
  
• (4,5) MIGHT - Chest
  
• (6,6) PERCEPTION - Chest

Level 3

• (11,9) PERCEPTION - Chest
  
• (11,18) MIGHT - Chest

Level 4

• (19,11) PERCEPTION - Chest
  
• (24,9) MIGHT - Chest
  
• (24,15) MAGIC - Urn
  
• (8,16) MAGIC - Chest
  -- party keeps saying "What's that?" even when opened, maybe another nearby
  
• (0,7) PERCEPTION - Barrel

Several Chests require to answer a riddle to be opened

Level 1

• (12,5) MAGIC - Chest (Cloud)
  
• (5,3) PERCEPTION - Chest (Nothing)
  
• (3,9) MIGHT - Chest (Death)

Level 2

• (11,14) MAGIC - Chest
  
• (8,5) PERCEPTION - Chest (Coin)

Level 3

• (13,8) MIGHT - Chest (Flute)
  
• (8,7) MAGIC - Chest (Mushroom)
  
• (6,7) PERCEPTION - Book

Level 1

• (6,10) MAGIC - Chest
  -- guarded

Level 2

• (8,0) MIGHT - Chest

Level 1

• (8,8) MAGIC - Chest
  
• (9,0) PERCEPTION - Chest

Level 2

• (4,3) MIGHT - Lever to 4,3 door

Level 1

• (13,9) PERCEPTION - Chest
  
• (9,13) MIGHT - Chest
  
• (8,10) MAGIC - Chest

Level 2

• (9,7) MAGIC - Pressure plate
  
• (2,13) PERCEPTION - Pressure plate
  
• (10,13) MIGHT - Chest

Level 0

• (3,13) PERCEPTION - Barrel
  
• (3,2) MAGIC - Chest

Level 1

• (14,7) MIGHT - Chest

Main Level

• (15,6) PERCEPTION - Chest
  
• (12,10) MAGIC - Chest
  
• (2,2) MIGHT - Chest

Level 2

• (11,17) MIGHT - Barrel
  
• (17,15) PERCEPTION - Barrel
  
• (20,19) MAGIC - Barrel

Level 3

• (3,7) MIGHT - Barrel, dig spot
  
• (20,3) MAGIC - Chest
  
• (19,12) PERCEPTION - Chest

Level 1

• (4,22) MAGIC - Chest

Level 2

• (3,7) MIGHT - Chest
  
• (17,10) MAGIC - Chest
  
• (8,9) PERCEPTION - Chest
  
• (12,25) PERCEPTION - Chest
  
• (5,18) MIGHT - Chest

Level 1

• (15,21) MIGHT - Chest
  
• (3,23) MAGIC - Chest
  
• (15,15) PERCEPTION - Chest

Level 2

• (2,9) MIGHT - Chest
  
• (12,4) MAGIC - Chest

Level 3

• (11,10) MIGHT - Chest
  
• (6,1) PERCEPTION - Hidden lever

Level 1

• (21,7) MAGIC - Chest
  
• (17,20) MIGHT - Chest

Level 2

• (11,31) PERCEPTION - Chest

Main Level

• (12,1) MAGIC - Chest

Level 1

• (2,11) MAGIC - Chest

Summer Palace

• (20,14) MIGHT - Light Ward

Garrison

• (7,0) PERCEPTION - Barrel
  
• (1,2) MAGIC - Chest
  
• (17,9) MIGHT - Chest

Dwellings

• (4,4) MAGIC - Lever
  
• (23,11) PERCEPTION - Cog