crossplay characters, two players, cooperative puzzle, medieval castle, snowstorm, blizzard, heavy coats, fur-lined hoods, walkie-talkies, teamwork, icy breath, frozen breath, intricate puzzles, torchlight, dim lighting, stone walls, ancient library, rusted armor, ghostly presence, eerie atmosphere, distant howling wind, survival, communication, full-body armor, knight and explorer, contrasting outfits, dynamic duo, split-screen view, atmospheric lighting, detailed textures, realistic materials, immersive experience, co-op gameplay, cross-platform.