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22 years later, modders are keeping SimCity 4 alive

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SimCity 4 was released in 2003 , the fourth in game company Maxis’ series of city-building games.

The ability for players to add their own content to the game was a key part of its appeal from the start.

Modder Ulisse Wolf says that, for him, it’s ultimately a question of community.

SimCity 4 modding continues to evolve and encompass new possibilities, largely because of improved access to the game’s source code.

The Network Addon Mod ( NAM ) is a sprawling package that includes pedestrian malls, a new railway system, roundabouts, canals, bridges, and underpasses.

The mod remains in active development — its 49th version was released in March 2025 .