Mountains of bubbles rises from a secret place deep in the forest,nobody knows where those bubbles come from. Bubbles are in different colors: red,yellow,white,green. Some bubbles have special function. If you don't bust those bubbles and let them cross the warning line,they will occupy your home and ruin everything they can find. There happens to be a cannon in your house and use it to generate bubbles that can bust invading bubbles. Bubbles have a feature:connect bubbles with same color and they will vanish like they never exist.