strategy game, Civilization VI, mods, enhanced user interface, historical leaders, custom civilizations, unique units, new city-states, expanded policies, gameplay balance tweaks, AI improvements, graphic enhancements, realistic terrain, 4X game mechanics, turn-based, global strategy, world map, hex tiles, cultural expansion, military conquest, scientific development, diplomatic relations, modding community, Steam Workshop, immersive experience, strategic resources, custom scenarios, alternative history paths, fan-made content, high replayability, mod installation, game modification tools, in-game editor.