RoboSockets by Tatem Games is pretty impressive -- it takes one of the oldest game genres out there, the falling blocks puzzle, and puts an interesting new spin on it. The idea is that you're in charge of a far-away planet full of robots with only a little energy left in each, and you've got to chain them up together to power up and eventually save the planet. The robots (all square, of course) drop from the top of the screen, and you can drop them wherever you want. But they each have sockets that have to be connected, and once you connect five in a row, they'll explode, providing you with power to finish the level.
It's fun and well done -- the sockets provide a nice bit of complexity, and special items and power-ups that come down as you go along mix up the gameplay well. The robots are cute and well-designed, and the music and art do a fine job of filling in the background. The tutorial is clear and simple (though some of the English is a little off -- forgivable, as Tatem's based in the Ukraine), and full Game Center integration is a nice bonus for sure.
RoboSockets is only US$0.99, too, so if you're at all interested in the gameplay, it's worth checking out. We'll be talking with Tatem next week at GDC, I believe, so stay tuned for more on what we can expect from them in the future.