One of the most clever puzzle games ever created, World of Goo sees you using a bunch of sentient goo balls in order to make structures to reach a pipe and suck the remaining ones up to safety. The game physics is what gives the game its addictive quality -- you've got to construct bridges and towers without the whole thing collapsing, dealing with dangerous territory like spikes and windmills later on in the game. It's tricky and entertaining and you're always looking to go back and try it using less goo.

Forty-eight levels await you as well as a bonus game called World of Goo Corporation, where you have to simply build the tallest tower that you can. It's much trickier than it sounds.

Besides an excellent WiiWare adaptation (that smartly utilizes the Wii remote), the game has been ported to iOS and Android as well, so you can take your goo on the go.

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