In Infamous 2, the sandbox city of New Marais is almost entirely static and unchanging. Cole’s actions have little impact on the city throughout most of the game.
Fallout: New Vegas contains a complicated faction system that adds depth and complexity to Fallout’s sandbox world. Over time the player develops reputations with the various factions that have major impacts on the unfolding of the game. Examining this system provides a good set of guidelines for creating a faction system in any RPG sandbox world.