Critical Thought Games has geoDefense (iTunes Link) in the iTunes App Store for FREE for a limited time. Deal expires May 29, 2011.

Something exciting and new in the Defense genre! The geometric vector creeps are fast and intense. With 30 different maps, each its own puzzle, you’ll have to work fast to keep up.

Using exciting vectorized graphics, this highly kinetic game brings a whole new dimension to the defense genre. Devastate creeps with blasters, lasers and missiles and watch their energy debris swirl through the gravity wells of your vortex towers. Now it’s time to figure out how to put that absorbed energy to good use.

Gamerizon has Chop Chop Ninja (iTunes Link) in the iTunes App Store for FREE ($3.99 value) for a limited time.

The world needs a hero! The Emperor’s daughter is in danger and needs your help! Face your enemies and explore the world to save your princess from a terrible curse! Use the ancestral ninja arts to fight hordes of enemies, destroy objects, avoid traps and many other dangers. Chop Chop Ninja is a fun and intuitive platformer specifically designed for the iPhone & iPod Touch!

Clickgamer has Office Gamebox (iTunes Link) in the iTunes App Store for FREE for a limited time.

Bored at work, not anymore with the super fun Office Gamebox! It’s a 3-in-1 game pack based around an office theme. With amazing replay value, a bunch of simple pick up and play games. I’m sure you can find time to play!

GAME 1 – PAPER SNIPER
Flick the paper ball at the wastebasket, using the cool air fan to bend your shots. You have only sixty seconds to get the highest score, but the further the basket the more points you get!

GAME 2 – CHAIR RACE
How far can you roll your office chair through the floors of the office block? In your way are all sorts of obstacles in your way; photocopiers, desks and water stations! Luckily you have a chair modified with a fire extinguisher’s jet! Oh, and don’t forget to grab those cookies and donuts.

GAME 3 – PITCH A PENGUIN
Migrate to the roof of the office and take a running jump to see how far that flightless bird will go. Grab a fishy in-flight meal to give your tiny wings a bit more energy, or grab onto a rocket to increase your speed. Watch out for the other birds – they will do anything they can to stop you in your tracks…

The Iconfactory has Ramp Champ (iTunes Link) in the iTunes App Store for FREE for a limited time.

A new twist on the classic boardwalk games skee-ball and pinball, Ramp Champ will delight and challenge players young and old. Four levels, or “ramps,” are included by default: Clown Town, Breakwater Bay, Icon Garden & Space Swarm. Flick your finger to roll balls down each of the themed ramps to earn virtual tickets which can be redeemed for prizes and digital loot. Ramp Champ is great for players wanting to play for 5 minutes collecting tickets or several hours working to solve the unique puzzles hidden inside each level. When you’ve completed the default ramps, more adventures await you via Ramp Champ’s in-app purchase option. Each add-on pack offers new challenges, original music and collectible knickknacks.

Triniti Interactive Limited has Yoo! Sports (iTunes Link) in the iTunes App Store for FREE for a limited time.

A custom 3D avatar at your fingertips. A sports resort in your hands.

If you’ve ever made an avatar on Wii™ or Xbox 360™, you know how fun it can be to personalize and dress your creation just the way you like. Even better is being able to take your avatar into the games you love, and to play as yourself, in your own virtual universe.

Now, Yoo! Sports brings the entire personalized gaming experience to your iOS device, and it’s with you everywhere, all the time.

One more thing…

Yoo! Sports isn’t just highly personal, it’s also amazingly social. With full Game Center leaderboards and achievements for every sport, you’ll be competing and sharing with your friends in no time.