Free games are all around us, but they may not be as easy to find as you’d think. We help you sort through the App Store to find the latest price drops and limited time offers so that you won’t have to spend a penny. Today’s free games include defending the earth from an alien assault, the unholy marriage of pinball and billiards, a space trading simulation reborn and more!

Free iPhone Games is a new feature on Gamezebo. Be sure to check back every day to discover the latest and greatest games that have just gone free on the App Store!

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Sentinel 2: Earth Defense – The sequel to the award-winning tower defense game Sentinel: Mars Defense brings the interplanetary war to our very doorstep! Normally $2.99, this popular TD is free today only as part of OpenFeint’s free game program.

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Bumper Stars – Billiards meets pinball in this outstanding and simple game about bashing into things. Normally 99 cents, Bumper Stars is today’s featured title on freeAppCalendar.com. (Review)

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Outer Empires – If you’re old enough to remember the BBS game Trade Wars, you’re going to have a ball with Outer Empires. An iPhone MMO centered on transporting freight in space the price has dropped from $1.99 to free for today only.

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Power Rainbow Puzzle – Sometimes we just want the simpler things in life. For that, there’s Power Rainbow Puzzle. Tap cute little slimes on the screen until they’re all the same color to advance. Simple, easy, fun – and today only, free.