if event key =k_escapeterminate(terminate if the keyup event was for the esc key pygame event post(eventput the other keyup event objects back the terminate(and checkforquit(functions were used and explained in the sliding puzzle so we will skip describing them again reusing the constant variables def flashbuttonanimation(coloranimationspeed= ) if color =yellow sound beep flashcolor brightyellow rectangle yellowrect elif color =blue sound beep flashcolor brightblue rectangle bluerect elif color =red sound beep flashcolor brightred rectangle redrect elif color =green sound beep flashcolor brightgreen rectangle greenrect depending on which color value is passed as an argument for the color parameterthe soundcolor of the bright flashand rectangular area of the flash will be different line to sets three local variables differently depending on the value in the color parametersoundflashcolorand rectangle animating the button flash origsurf displaysurf copy(flashsurf pygame surface((buttonsizebuttonsize)flashsurf flashsurf convert_alpha(rgb flashcolor sound play(the process of animating the button flash is simpleon each frame of the animationthe normal board is drawn and then on top of thatthe bright color version of the button that is flashing is drawn over the button the alpha value of the bright color starts off at for the first frame of animationbut then on each frame after the alpha value is slowly increased until it is fully opaque