How to add an countdown timer in a game for ech round

In any script, you can use the dt variable passed to the update function to increment a timer. For example:

var Timer = pc.createScript('timer');

// initialize code called once per entity
Timer.prototype.initialize = function() {
    this.timer = 0;
};

// update code called every frame
Timer.prototype.update = function(dt) {
    this.timer += dt;

    if (this.timer > 10) {
        // 10 seconds has elapsed - do whatever you need here...

        // Reset the timer
        this.timer = 0;
    }    
};
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