Portals to other dimensions are popping up all over the town of Arkham, MA and you must enter the portals, defeat the horrors you find there, and rescue the town before you go insane. This is the premise of Arkham Horror, the hugely successful Lovecraftian board game by Fantasy Flight Games ,who are known for deeply complex and heavily narrative themed games.
Recently I stumbled upon @ArkhamHorror on Twitter, one of the most interesting cases for emergent narrative in games. Each tweet is a microfiction retelling of solo play-throughs. Talk about remediation: fiction prose based on a game based on fiction prose.