The latest and greatest tower defense game is here. Sentinel 2: Earth Defense by Origin8 is a very well designed sequel to the popular Sentinel: Mars Defense. The mission to save the mining colony on Mars has failed and all personnel were lost. Two months later, unidentified ships were picked up on radar heading towards the Earth. In preparation for battle, your ship, the Sentinel, was given a full weapons upgrade and is now fitted with deadly weaponry. Your job is to defend the Earth from the alien invaders.
Sentinel 2 is a great sequel to the first Sentinel. It has the same graphics and controls as the original game. There are many things that have changed, though. All for the better, I think. There is a wider variety of aliens that you must fight against, including some that can teleport when struck by the slowing towers. There are also more weapons to choose from. There is now a booster tower that boosts the power and range of the other defenses around it. There is also an ion tower that can be very useful in fighting all types of enemies. The use of repair drones to harvest and repair for you has also been improved upon. Now, when you buy these drones you can specify what you want their priority to be. You can tell it to repair your gates as a first priority or to harvest only and never repair.
One of the biggest enhancements to this version of Sentinel is the addition of the weapons on the Sentinel itself. Now you have a whole new line of defense. There are four different weapons that your ship can provide. First, you must charge them, though. At the end of each attack wave, energy is beamed up to the Sentinel from one of your gates, but only as long as it is not destroyed. You can also buy drones, similar to the repair drones, that have the ability to synthesize energy for your ship’s weapons. There is a button in the bottom right corner of the screen that allows you to toggle back and forth between the towers you place on the ground and the ship’s weapons.
In this second version of Sentinel, Missions were also added. These are short games with specific objectives. Many of them involve you keeping invading aliens at bay with some specific limitation. For instance, in one, you must defend your gates without any monetary resources or towers at your disposal. Luckily, you only have to survive one wave of attackers. Each time you complete one, the next mission is unlocked. There are a total of 8 missions.
Another new addition to Sentinel 2 is the integration of OpenFeint into the app. When you first launch the app, it asks whether you want to allow Feint to run or not. OpenFeint is, according to their website, “The premier Social Platform for iPhone games made by Aurora Feint with friends lists, social profiles, leaderboards, chat rooms, facebook and twitter integration, cross-promotion, achievements and more!” If you choose to allow OpenFeint to run in your app it will allow you to access chat rooms and leaderboards directly from your app. You can also import friends from Twitter or Facebook. Then, you can allow your friends to see what you are playing and the achievements you get, as well as keep track of their stats as well. The biggest complaint I have about it is that after letting OpenFeint run for awhile on my iPod, I decided to turn it off and could not figure out how to do that. So, make sure you turn it off from the beginning if you are not interested.
Sentinel 2 has 4 maps to defend. You can play in assault mode where the attackers come in waves or endurance mode where they come continuously. There are also 4 levels of difficulty. I appreciated that the easy mode was, in fact, easy. So many games are way too difficult even when you play in the easiest play mode. With so many play options and so much variety, Sentinel 2: Earth Defense is sure to be a long term favorite.
Developer’s Website: http://www.origin8.com/