Forgotten Realms - Demon Stone

Secret books:
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Successfully complete the following levels to unlock the secret book.

Attack at Cedarleaf   - Zhai's Past
The Wizard's Tower    - Khelben's Letter
The Jungles of Chult  - Illius' Youth
The Yuan-Ti Temple    - Nesme's Fall
Stand at Mithral Hall - Cireka's Vow Drizzt's Journal 
Into the Underdark    - Ygorl And The Dragon

Unlimited gold and experience:
------------------------------
The level "Into The Underdark" has unlimited experience and gold. 
When you get to the part of the stage with the ice barrier and wizards, 
switch to Zhai and use the shadows on the right side of the bridge to 
sneak attack enemies that appear from the right tunnel. You can do this 
as long as desired. Zhai steals gold from enemies when invisible. Get 
as many kills as possible. When satisfied, continue on to fight Cireka. 
Only kill the wizards that fire missiles at you. The large slow moving 
bombs go directly for the character you are currently playing. 
An unlimited number of enemies will flow from the portal. Kill them and 
get your characters' hero meters up. When full, use it repeatedly. You 
must do this at least twenty times for decent experience. The more times 
you do your team attack, the higher the experience multiplier at the end 
of the level.

Picture gallery:
----------------
Successfully complete the following levels to unlock the picture
in the gallery.

War in Damara         - Battlefield
Gemspark              - Concept Art
Attack at Cedarleaf   - Cedarleaf
The Wizard's Tower    - Wizards Tower
The Jungles of Chult  - Chult Jungle
The Yuan-Ti Temple    - Chult Temple
Stand at Mithral Hall - Mithral
Into the Underdark    - Githyanki Outpost
The Dragon's Lair     - Dragon
The Lord of Chaos     - Limbo


Completion bonuses:
-------------------
Successfully complete the game under the hard difficulty to unlock the
Red Dragon Armor for Zanek and be able to use the Silver Sword. You can
get the Red Dragon Armor after you complete the tenth chapter under the 
Hard difficulty setting. Go into "Upgrades" and then into the armor 
upgrade for Zanek. It will appear directly below the mithril armor. 
The Silver Sword will already be equipped and cannot be upgraded.