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The best game you could play. Period.
Over 600 hours and counting! When you get bored, install mods for a whole new experience.
CRPG is the best persistent character multiplayer mod, in which you can level characters.
Full Invasion 2 is the best pick up and play multiplayer mod, surviving swarms of enemies.
Single Player mods: there are too many to count. Gekokujo is an excellent Samurai adaptation, there are also good lord of the rings and game of thrones mods.