Car Darts: Rocks and Rolling

While you were in space we found this water planet. It seems to have oddly spherical rocks that seem to float in the air. Don't expect this to be easy; in fact, take it as a warning that getting a decent medal on these next levels are going to be extreme...but that's why you've chosen this theme, right?

Overview:

Power Ups: x8|x8|x4|x4|x4|x2

Medals are as follows:

Bronze->|750

Silver->|1500

Gold->|2500

Platinum->|10500

Diamond->|47500

Dev. Best->|49920