In this one it's all in the placement of vertical bubbles that will get you through. Focus on clearing the tied up bubbles because it will then give you more room to distroy the triangle. Don't be afraid to shake your device for this one helping move some of the bubbles into place

Get as many explosions as you can also don't be afraid to use the rainbow bubbles, go as far as you can. Be wise in the character you use for the boost.