Warhammer 40,000: Darktide, cross-platform, multiplayer, cooperative gameplay, futuristic gothic environment, space marines, chainswords, bolters, grimdark atmosphere, co-op missions, hordes of enemies, industrial structures, dim lighting, 3/4 view, action-packed scenes, detailed textures, metallic surfaces, dynamic shadows, PC and console compatibility, seamless matchmaking, squad-based tactics, voice communication, real-time combat, strategic positioning.