[H] Change Steam Game (Keys) for Others Game (Keys)

I have a few Game titles on Different Platforms Steam, Uplay, Desura and Other
Let interested to submit to Pryv or on Steam

I look forward For Proposals Exchanges
For Example:
Dark Soul, Terraria, Millennium 2, Hero Academy, Guardians of Middle-earth, El Matador, Date Island Riptide
And Other Suggestions (Wish List)

Game For Change:

• Far Cry 3 Blood Dragon(Uplay)(PL)
• Alien Rage(Steam)(PL)
• Dogfight 1942(Steam)(PL)
• Alan Wake American Nightmare(Steam)(PL)
• Patrician IV (Kalypso)(PL),
• Stacking (Steam),
• Nightmares From the Deep: The Cursed Heart(Steam)(PL),
• Thief Gold (Steam)
• Battlestations: Midway (Steam)
• Just Cause (Steam)
• One Way Heroics (Steam)
• 100% Orange Juce (Desura)
• 3 Stars of Destiny (Steam)