Trials Dunwall City is an extension of Dishonored containing 10 cards that test players' skills in combat, stealth and agility.
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Battlefield 3: Aftermath & Dishonored DLC head up Xbox LIVE April 1st one-day sale in Article Comments
Their ongoing sale was ok, but this was hyped as being a special one day event and it's pretty poor. However, I'm still holding out hope that tomorrow's Microsoft Studios sale will be good.
Out today worldwide on Xbox 360 and for PS3 in the US.