game.js

var timeoutHandle;
    function countdown(minutes, seconds) {
        function tick() {
            var counter = document.getElementById("timer");
            counter.innerHTML =
                minutes.toString() + ":" + (seconds < 10 ? "0" : "") + String(seconds);
            seconds--;
            if (seconds >= 0) {
                timeoutHandle = setTimeout(tick, 1000);
            } else {
                if (minutes >= 1) {
                    // countdown(mins-1);   never reach “00″ issue solved:Contributed by Victor Streithorst
                    setTimeout(function () {
                        countdown(minutes - 1, 59);
                    }, 1000);
                }
            }
            if (seconds==0 && minutes ==0){

              alert("Game over");
              reset();
            }
        }
        tick();
    }

    countdown(1, 00);