World of Goo is available for the PC (I played the demo via Steam) and WiiWare, which I can being just as easy to pick up and play. The game premise is very simple, there are small blobs of goo, and your job to connect them and build them to the end of the level. The unused goos move around whatever structure you already have built, and you merely pick up one of the suckers and move him outside, where he slightly expands your current building. And by overcoming pesky problems like physics and gravity, you move your goo structure to a pipe that sucks up the remaining goos and lets you move on to the next level.
The demo shows off a small bit of the variety, with goos with different abilities, like those that can be removed and reattached to whatever you build, as well as different obstacles that can make a mess or tear apart your work. And one can only hope that the worlds following the first one continue to bring new and fresh challenges to the player. I was reminded the whole game of Fantastic Contraption, by being able to build and try and reach some end point, but Goo is that on a whole new level.
I also found myself enjoying the cute, cartoony aesthetic, with the crude people and animated eyes of the goos, and the levels all have a somewhat crude, dirty design, probably half due to the goos, and the other half being the shady corporation that has you collecting them.
Anyone interested in the Fantastic Contraption sort of building should at least grab the demo and try out the more complex World of Goo.