Some add new stories, new mechanics, or can even change the genre of the game itself. Mods can do more than just enhance a game. Thousands of devoted fans spent hundreds of hours learning how to modify the game's assets to make something truly special. It was also a pioneer for one of the largest communities ever seen on PC.
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Half-Life was the pioneer of interactive storytelling, allowing players to remain in full control of their character while engaging in memorable dialogue that would typically be relegated to a cutscene.