[GWC Quest] Cheer GWC2011?

I'm Just Curious how to obtain or to have a GWC coin,, cause i Finished Dungeon + or - of my Level.. till now didn't have one, just i Missed Something?

Is it Drop or Drop Rate?
Or it was just like heroic coins that obtain after dungeon,,
If it is Like Heroic Coins? Does it have Chance also??

i'm so Confused,, wew.. thanks in advance,

you need to finish dungeon with green color on their level and the drop of the coin is random.. you can't always get it

Last question,, is it from monster? or just after the dungeon,, ?

after the dungeon

after the dungeon either + or - 2 of your current level,, it will give 3 coins each completed dungeon