Nintendo's WiiWare service may not spawn as many hits as the in-house company, but games like World of Goo are exactly the kind of thing we want to see as downloadable content. Taking the simple concept of building blocks and using the adorable little "Goo Balls" as playable characters, World of Goo gives gamers the puzzling challenge of constructing oddly-shaped objects in order to reach the exits of various levels. What makes World of Goo such a challenge is the need to fight various elements, like gravity, gaping pits, and various death traps. It's no wonder this title won so many awards, including honors at the Independent Games Festival of the Game Developers Conference in 2007. If you don't own this awesome Wii game, at least give it a try.