If the game freezes, just click inside it (games can get unresponsive if you click elsewhere on the page).
Move the slender rod up and down to assemble the bubbles in the right place. Allow the bubbles to move in the gap present in the rod. Collect the red color bubbles on the left side column and blue color bubbles on the right side column. To score more, try to assemble the bubbles soon.
Use Mouse to interact.