How would i INPUT a countdown timer in a game? I would want it to be simple and easy. this would be actually the first program i would make. So i wanna know what should i do to start making this program? Whats the first step on making it? And how should i code the countdown timer?

I also want the timer to be shown for everyone thats playing in the game also. So if thats not possible, maybe Broadcast a shoutout saying that its over???