 SEATTLE, Sept. 28, 2021 GLOBE NEWSWIRE -- DoubleDown Interactive NASDAQ: DDI, a leading developer and publisher of digital social casino games, announced the worldwide launch of its first-ever RPG, Undead World: Hero Survival, a zombie apocalypse game that features hero-collecting and idle gameplay. The game launched on September 27, 2021 and marks a departure from the social casino genre for the company. 