Use the arrow keys to navigate (Up key or Space to rotate).
Everyone knows classic Tetris. What makes the current game different from the old one is the relation of the colors to each other. Upon the destruction of a row, not only the elements in the row, but the interconnected elements of the same color are destroyed as well.
In Campaign mode the goal is to destroy the dotted elements.
In Skirmish mode you will have to cope with the randomly appearing dots.