One of the biggest changes made when Spelunky moved from PC to XBLA was the addition of multiplayer. Developer Mossmouth has been secretly working on two new DLC packs which increase multiplayer offerings and surprised everyone via Twitter with their unexpected release. The Explorers pack introduces 8 new playable characters: the Eskimo, the Robot, the Viking, the Round Girl, the Round Boy, the Cyclops, the Ninja, and the Golden Monk, which can be used in any game mode. The Arena pack provides 24 new Deathmatch arenas where you can use your new characters to murder your friends. Both packs cost 160 MSP and are available now on the Xbox Live Marketplace.