Today’s free iPhone app at FreeAppADay.com is Navy Patrol: Advanced Premium, from ICS Mobile.
The game is complex tower defense title containing three different play styles for underwater battles, aerial battles, and sea battles. There are nine different upgradable turrets to place on the battlefields, and the enemy AI (consisting of eight different enemy types) is setup to change their path to avoid the placement of your turrets.
There’s a skill tree that adds RPG-like elements to the title, and three difficulty settings, so that players of all skill levels will be able to jump into the title. In addition, you can play in multiple gameplay modes, including an endless mode that unlocks for each individual level after you beat it otherwise.
You’ll earn achievements as you go through the game, and you’ll be able to experience the entire game in this unlocked version. Future updates and additions will be available free of charge, as the game doesn’t contain “in-app purchases.”
If you’d like to get your hands on Navy Patrol: Advanced Premium, make sure to download the game while it’s free today.