Many were hoping for a trailer. Instead, they got a treasure hunt. The first wave of Joker's international tour has begun and, like its American counterpart, there are prizes for those quick enough to get to the addresses before any other clowns show up.
Sadly, it looks like the London treats have already gone (they're stamped) - how fast are Bat-geeks anyway? - but we'll let you know when we hear more.
In the meantime, check the map for an address near you!