You can earn special bubbles by making a combo of a certain size or shape. Popping eight bubbles in a row will result in a bomb bubble. This special bubble can eliminate surrounding bubbles. Pop ten or more bubbles to create a rainbow bubble. When matched with another bubble, it will eliminate all bubbles of the same color. When you have four bubbles of the same color next to each other in a square formation, pop them in a "U" shape to create a cross bubble that can eliminate every bubble horizontally and vertically from it. Note: The four bubbles must be close to being a perfect box. Drag and hold to see a faint plus shape appear to indicate they are a valid formation to create a cross bubble. Use them to free pets trapped in ice or jelly that are out of range. Combine special bubbles together for an even greater effect. For example, mix one bomb bubble and one cross bubble will clear three rows horizontally and three rows across. Mixing two rainbow bubbles can blow up every bubble. Mixing a rainbow and bomb bubble to turn all bubbles of one color into bombs. Match a cross bubble with a rainbow bubble to fire crosses off all over the screen.