The conversation between human and AI assistant.
Should I buy Civ IV or Civ V?
That sounds good. Are there any specific features in Civ V that make it stand out?
Civ V introduced new concepts such as hexagonal tiles, the use of a "social policies" system to allow greater customization of in-game development, and new mechanics for city-states that could be interacted with in a variety of ways. Additionally, the game includes a robust multiplayer mode and a scenario editor that allows players to create their own custom scenarios.