Fight Aliens, Take Pictures Like a Pro, and The Zen of Puzzles

Can you imagine a smartphone without a tower defense game? I'm pretty sure the genre got a huge boost once Apple opened the App Store. Well today's build-a-turret to keep the baddies out is based on an alien world. That'll teach those aliens to do whatever they did to piss us off. Plus, we get a "professional" camera app, a droplet puzzler, and we're fighting for mankind's future, all in today's best app deals.

Fight Aliens, Take Pictures Like a Pro, and The Zen of Puzzles

iOS: Sentinel 3: Homeworld - Free

You're taking the fight to the alien home world. I'm guessing Sentinel 1 & 2 involve fighting elsewhere. Maybe Earth, possibly the moon. When you're playing a tower defense game, story isn't all that important. What is important is turrets. Sentinel 3: Homeworld has 20 unlockable turrets you place on the battlefield to battle the aliens for whatever misdeeds may have angered you. Dropped from $3 to Free. [DealMac]

Fight Aliens, Take Pictures Like a Pro, and The Zen of Puzzles

iOS: ProCamera - $2

This app won our photo app award for 2010. Sure that was a year ago, but something doesn't stop being awesome because a year has gone by. Well, unless you count Ke$ha songs. With rapid fire mode, volume button shutter, anti-shake stabilizer, and an adjustable self-timer, it's no wonder we loved it. Save a buck and you can love it too. Dropped from $3 to $2. [AppShopper]

Fight Aliens, Take Pictures Like a Pro, and The Zen of Puzzles

iOS: Quell Reflect - $1

You want to know what's great about puzzle games? You can start playing and days later you look up and you might not even realize that you've been fired from your job. Okay, that's not really great, but a good puzzle game should keep you glued to your iPhone. With over 80 levels, it looks like Quell Reflect's slide-a-droplet-to-capture-the-pearls gameplay could be the career-ending puzzler you're looking for. Dropped from $2 to $1. [Appsylum]

Fight Aliens, Take Pictures Like a Pro, and The Zen of Puzzles

Android: Shadow Guardian HD - $1

You're a investigative journalist that used to be a soldier. That sounds pretty good right? Oh and you're traveling the world battling evil doers in your quest to save mankind. Okay, that sounds awesome, but I'm not sure his editor is going to allow him to submit an expense report full of round the globe purchases in this adventure game. The airline tickets alone are probably more than he makes in a year. I guess adding "saving the world" at the top will make it better. Dropped from $6 to $1. [Apps-aholic]