Civilization V is a grand-strategy game with high variation in strategies and tech available to each of the countries. Very enjoyable with or without a party for people who enjoy turn based strategy with opportunities for mass variation in how you spec your tech tree to how you approach diplomacy with other countries. My major gripe is the mostly linear progression in the army building and that sessions can take a large amount of time in one sitting.

Highly recommended regardless due to its completely enjoyable experience.