The Special category of treasures include some treasures found on limited time maps or in an unusual way.
These collections were first released in the Asian campaign, but are found on the special tab. They are also found in other limited time maps. They are referenced in the code as matter because the rewards are made using the collectibles.
These collections were released during the Halloween Event. As of now they are only obtained via Wishing Well.
These collections were released during the Thanksgiving Event.
These collections were released during the Holidays 2010 Event.
These collections were released during the Valentine's Day Event.