This week's Games for Windows LIVE Deal of the Week sees indie hit World of Goo (PC) taking a whole 75% off, lowering the game to either $4.99 or £3.75, depending on your locale. As with the past few Deals of the Week, this title is LIVE enabled, and does come with all the bells and whistles we've come to love (read: achievements).

World of Goo is a physics based puzzle / construction game. The millions of Goo Balls who live in the beautiful World of Goo don't know that they are in a game, or that they are extremely delicious. • Mysterious Levels: Each level is strange and dangerously beautiful, introducing new puzzles, areas, and the creatures that live in them. • World of Goo Balls: Along the way, undiscovered new species of Goo Ball, each with unique abilities, come together to ooze through reluctant tales of discovery, love, conspiracy, beauty, electric power, and the third dimension. • The Sign Painter: Someone is watching you. • World of Coo Corporation: Congratulations! World of Goo Corporation is the Global Leader in Goo and Goo Related Product, including World of Goo Corporation Trademark Brand Soft Drink Beverage and World of Goo Corporation Trademark Brand Facial Exfoliating Lotion. Succulent!
You can head here or to the external link below to purchase and download the game.