The classic bubble game. It is easy to play, but difficult to master. The objective is to connect bubbles of same color to make large blocks of bubbles before eliminating them. The more bubbles you have in the block before they are eliminated, the greater number of points you will get.
To eliminate a bubble, the bubble must be connected to other bubbles of same color on the game board. If you touch a bubble that is connected, those connected bubbles will be highlighted and a prompt will be shown, displaying that blocks points. Touch your selection again to eliminate the bubbles. You can check "one touch eliminate" in options menu too.
Shifter is an extended mode. When a set of bubbles has been eliminated, all remaining bubbles to the top and left will shift down and to the right.