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To celebrate the download of their 25th billion app, Google is slashing app prices down to 25 cents. It's a sale that runs for five days, with new apps being unveiled each day. They're not easy to find at first, so I'm listing the apps here as they go on sale. You can find all the apps for the first day here.
World of Goo
Android - $0.25
iPhone/iPad - $2.99/$4.99
Oh you are in for a treat. Very creative and slippery with fun, this physics-based puzzle game has you building bridges and structures using different types of sticky, black balls. Highly recommended.

FIFA Soccer 12
Android - $0.25
iPhone/iPad - $4.99/$9.99
Includes 22 leagues, 500 Teams, and 1,500 players, all officially licensed. Touch controls help you handle the ball with precision and perform free kicks and penalty shots. This is the only officially licensed FIFA game for smartphones.

Dungeon Village
Android - $0.25
iPhone/iPad - $3.99
An epic role-playing game where you must build a humble hamlet and guide it to become the mecca for all the adventurers and explorers of the land. Build wizard schools and practice halls to improve the skills of visiting adventurers then send them out on quests to earn you money. IF they stick around long enough they might even settle down and call your hamlet home.

Mini Motor Racing
Android - $0.25
iPhone - $1.99
Modeled after the races you might have with R/C cars, Mini Motors offers a wide range of upgradeable vechiles across 20 different tracks and various daytime and weather conditions.

Cut The Rope Experiments
Android - $0.25
iPhone/iPad - $0.99/$3.99
The sequel to the popular puzzle original, once again you have to cut ropes in such a way as to get food to the monster Om Nom, but this time the challenges are set up within the Pofessor's lab, forcing you to deal with rockets, water, robotic arms, and suction cups.

Paper Camera
Android - $0.25
iPhone/iPad - $0.99
One of my favourite apps for Android, Paper Camera let's you apply real-time special effects to your camcorder before you hit the record button, giving you a chance to see what your shots will look like in advance. Offers some great polarizing, comic book, and pencil crayon effects.

Double Twist Alarm Clock
Android - $0.25
Offering a choice of a flip or analog clock, Double Twist includes multiple alarm modes for napping, weekends, using ringtones, and even volume control that fades.

Sketchbook Mobile
Android - $0.25
iPhone/iPad - $1.99
A fantastic deal, this drawing app from Autodesk supports a wide variety of paints, brushes, penciles and other tools. You can create using layers and fix with a deep number of undos. This is one of the top drawing apps available, suitable for both pros and beginners.

Color & Draw For Kids
Android/Tablet - $0.25
iPhone/iPad - $0.99/$1.99
A Colouring book offering 50 drawings, multitouch painting, and the ability to "undo" mistakes. A special mode includes incomplete drawings where voice narration is used to help guide kids to complete them.

Flick Nations Rugby
Android - $0.25
iPhone/iPad - $0.99/$2.99
Built around the "flick and after-touch" controls of the flick series, Nations Rugby offers 15 Rugby world nations and a wide variety of kick challenges with varying degress of pressure and goals.

Shark Dash
Android - $0.25
iPhone/iPad - $0.99
This physics-based puzzle game takes place in a bathrub where you must help Sharkee and his toy sharks wage ware against an army of diabolical rubber duckies.

The Going To Bed To Book
Android - $0.25
iPhone/iPad - $3.99
Finding it hard to get the little ones to sleep? This story by Sandra Boyton is aimed at helping and now presented in this interactive version for phones and tablets, you have the magic of an animated pop-up book with gentle narration and illustrations that repond to touch.
