I already have another project that I want to combine with this one. It is a box with 2 buttons and 2 lights (blue and red) and 2 7-segment displays of 4 inch. When the red button is pressed and held, the red light will turn on and the display will begin a 10 seconds countdown. When the button is released, the light and the countdown is reset (vice and verca for blue). I'd like to include a timer for play time. Since I already use an arduino mega, I would found it more elegant to do it with the arduino than just using a kitchen timer.