Bubble Chains

The aim of Bubble Chains is to remove all of the targets on each level, and to do this before the time (indicated with the blue-colored bar at the right) runs out.

Keep doing this until you have passed the last level and won the game.
You have to collect color bubbles on the field by combining them into chains of three or more bubbles. To do this, press left mouse button on a bubble and drag the mouse over the surrounding bubbles of the same color. When all the desired bubbles are connected, release the button, and the chain will disappear.
Do not release the button until the whole chain is combined. If you want to cancel current combination, just drag the mouse over the bubbles back. Except of the color bubbles, there are special items which can be used as a placeholder for any bubble, making your life easier.