Select one color (Red, Green or Blue) you want to extinct. You can select a color by pressing on the desired color's symbol with the mouse, or by pressing the first letter of the color on the keyboard.

Choose a frame which contains the chosen color.

If the frame you chose contains the chosen color, this color will be removed from the chosen frame and its neighbor's frames which contain the color.

A frame is destroyed when it has no colors.

You have one minute to destroy as much frames as you can, while paying attention that no frames are reaching to the bottom.