Viking longship, Harald Hardrada, Berserker unit, stave church, fjords, coastal raiding, naval dominance, pillaging for resources, strategic resource gathering, early game expansion, sea-based trade routes, cultural victory, military conquest, rough terrain navigation, forest and hill tiles, unique district placement, snow and tundra adaptation, city-state influence, diplomacy, advanced seafaring technology, enhanced naval units, strategic barbarian combat, multiplayer strategy, single-player campaign, turn-based tactics, hex grid map, 4X game mechanics, grand strategy, historical leaders, cultural landmarks, civilization development, immersive soundtrack, detailed graphics, PC gaming, strategy guide keywords, civilization bonuses, unique civilization abilities, turn-based civilization building.