"Niffelheim.rar" typically refers to a compressed archive file containing the game , a 2D side-scrolling survival RPG developed by Ellada Games . In this Norse mythology-themed adventure, you play as a fallen Viking warrior whose soul is trapped in the cold, desolate realm of Niffelheim instead of ascending to Valhalla . The Core Experience To "make a piece" or understand what's inside this archive, Is NIFFELHEIM an Indie Survival Gem? - REVIEW