command /startg:
    trigger:
        broadcast "The game is going to start in 30 seconds"
        countDown(30)
        #next lines is if you want some action after this countdown
        wait 30 seconds
        {game.status} is not "stop"    #check if game is still running
        broadcast "The game is ended with a tie!"

#It depends on your game, here I created a command which will stop the countdown

command /stopg:
    trigger:
        set {game.status} to "stop"
        broadcast "The game has been stopped!"

function countDown(am: number):
    if {_am} is 30:
        set {time} to "00:30"
        set {_w} to 31
    else if {_am} is 10:
        set {time} to "00:10"
        set {_w} to 51
    wait 1 second
    loop {_am}-1 times:
        if {game.status} is "stop":
            stop
        if {_w} is greater than 50:
            set {time} to "00:0%60-{_w}%"
        else:
            set {time} to "00:%60-{_w}%"
        if {time} is "00:15":
            broadcast "Something"
        add 1 to {_w}
        wait 1 second