Not sure if this has been mentioned before but there appears to be a glitch in how the count down tiles work. The timers decrease by 1 in order from top row to bottom row and left to right. A CD tile can decrease by one and then if another CD tile below it activates and destroys tiles causing the higher CD tile to fall to a lower row it will decrease by one again. In essence it can decrease by more than one each turn.
Is this the way it is supposed to work?