People like age of war because they are easy to learn and play. But they still have a lot of strategic depth and the chance to be used again. Because of this, tower defense games are some of the most addicting games that can be played on smartphones and tablets. Tower defense games are fun and popular because their strategies are so flexible, easy to understand, and easy to change. Even if you aren’t a pro, you can still come up with your plan of attack. Most tower defense games feel different because they use different systems and strategies.