Why so serious?

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Popping around the internet and PlayStation Home right now there’s an ad  you can see above,  several billboards sprinkled throughout Home advertise “Exclusive Joker challenge maps” for the PS3 version of Batman: Arkham Asylum. Now is this legit or is the PS3  on the receiving end of Joker’s prank? either way it sucks  if its true this sucks for 360 owners and if its not theres gonna  be alot of pissed off PS3 owners.