Play Capture The Flag mode and make sure that it is
at least two or above. Get at least one flag, then press [Esc]
and go to the options menu. When in the menu, change the number
of flags to get to the amount that you have. If done correctly,
it will make the playing screen different colors. Note: This will
cause the game to stop responding. Press [Alt] + [Tab]
to leave the game, right click on it , then select "Close".