The larger solution to user frustration, Meier said, is to add difficulty levels, something he admitted being wrong about just a few years ago. "In the past I said four difficulties were perfect...I was wrong about that. We need nine." Meier did this in his hit game Civilization 4, which celebrates its five-year anniversary later this year. As Meier explained it, offering more paths for a player to go through will plant a seed in their mind of "what if," as in "what if I try this battle or part of the story again. Will it be different?"