Namco squares up to Tetris with new DS puzzler Trioncube

There is something intriguing about Trioncube. By carefully studying its Japanese website, it slowly becomes clear what you're trying to do is mesh together the five types of falling blocks by rotating them as they fall into an initial 3x3 square, called a Trion. Then, the trick becomes to expand that square by making sure subsequent falling blocks are dropped in such a way as to create a new 3x3 square.