Klax is an action/puzzle game where you must catch assorted color falling tiles and create rows, columns, or diagonals of a single color. Each level requires a different pattern to be made, and the tiles fall faster, more at a time, and in an increasing number of colors as the game progresses.
Gameplay involves quickly matching colors to fill spaces, while also trying to clear lines before they reach the top of the screen. As you progress through levels, new challenges are introduced, including moving blocks and more complex patterns, requiring quick thinking and fast reflexes.