Klax is an action/puzzle game where you must catch assorted colored falling tiles and create rows, columns, or diagonals of a single color. The goal is to progress through each level, which requires creating a specific pattern, while the tiles fall faster, more at a time, and in an increasing number of colors as the game gets harder.
The gameplay involves using your wits to match the falling tiles with the correct color and shape, trying to fill a grid without any gaps or errors. You'll have to think ahead and react quickly to catch the tiles before they disappear or create new ones that make it harder for you.