Want to try a tower defense game or sharpen you skills? City Conquest by Paul Tozour of Gas Powered Games is your answer. For those who are unfamiliar with Tower Defense games, City Conquest is a great first game. The game will teach you what to do step-by-step. Each “battle” consists of a certain number of turns where you must attack your enemy city, defend your own city, manage your resources, and upgrade your offense/defense.