I just now completed it!!! I used a Rainbow Jewel in combination with a spiked Jewel and that destroyed three of the spaces in the center. Then I used my helpers and shot the last one twice and that completed the level.

I am stuck there as well... I have tried the special jewels to shoot those things in the center and a combo of the round and pointy jewels to shoot the things in the center and nothing happens?!?!?

The trick is to explode the two bullet combos in line with the Bunches of dynamites so that you blow up the dynamites before they blow you up and that way you have enough time to complete the level

It just stays there and gets in your way until you blow it up. But if it doesn't affect the outcome of the level don't bother wasting your moves