World Of Goo is what many gamers immediately think of when they hear the words "Indie games." It's a physics based puzzler that taxes players to form increasingly complex structures with balls of sticky goo... which start simple and soon turn into unbelievably intricate architectural projects that are a pleasure to create. Besides the brainteasing gameplay, it's worth noting that World of Goo is also uniquely charming and profoundly beautiful. And it's less than two quid. Go buy it.