Unique Tetris/columns combination.

But this game is neither a tetris or columns clone. You have to build rectangles from same color of blocks or at least made them horizontally or vertically connected. Those block will be destroyed only in case a special block (diamond) will be put next to or on them. It sounds complicated, but it's actually pretty easy.
There are a few game modes: you may compete with your friend (2 player mode) or try to beat as many computer opponents as possible in Arcade mode. If you play very well you may unlock some things.

Controls:

Arcade mode:
arrows = movement
Up = rotate details

Two player mode:
Player 1
j,l = movement
i = rotate detail
Player 2
a,s = movement
w = rotate detail