There are multiple battle modes that keep it challenging. Earn “gold” and "experience” with each victory; gold allows the purchase of skills and equipment upgrades, while experience provides promotions in rank and opportunity to increase oil reserves. There are opportunities to win daily rewards (gold/oil) for certain battle modes based on the number of victory points earned. You must be “synchronized” to Apple Game Center to monitor these accomplishments. It often takes a while to get synchronized to the center, which is becoming a pain. Also, geting hard to get online battles against other opponents.

I really enjoy the game, but it either gets expensive or frustrating. Some maps are impossible without spending a ton of money, Also, only 7 free plays at a time is a pain. I wish they would accumulate higher instead of stopping.

Right when I downloaded the app, I couldn’t understands the words. The words weren’t ina different language, but they were filled-in, white bars. I couldn’t read anything, so I couldn’t play the game. I am very sad, I still give this a 3 star becuase I knew from other people that this game was very good. Maybe something was messed up on my computer, and that’s why I can’t read anything.

Good way to kill some time. Could stand to have new battles added more frequently, but generally a fun game.