If you miss a bubble (the game counts a miss if you don’t remove any bubbles). You will remove one bubble from your miss counter (the grey bubbles in the bottom left corner). Once this counter is empty (after 5 missed bubbles) there will be formed a new row on top. This moves the whole bubble field 1 row down. This can get you in trouble really fast. So keep an eye on the miss counter and make sure you won’t go to low. If the bubbles touch the bottom of the screen you are game over.