For several of the levels in the 400s, you have to create a chain of bubbles to hold up the switches.
Earlier thread on 444: https://forums.storm8.com/showthread.php?64973-Level-444
Remember that bubbles will stick to chains, btw.
And also remember not to pop all the colors, because then they'll disappear from your rotation, and you can't make a chain of more than 2 bubbles without multiple colors.