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World of Goo is the Impulse Daily Deal today. The game is on sale for $4.98 ($19.95). If you use coupon code SURVEY2010 at checkout you’ll save 10% off your order, which makes the game only $4.48. This is a great indie puzzle game and highly addicting. Can’t recommend it enough. It has a 90 metascore. You can get a demo on the 2D Boy Official site, the creators of the game.