Topic, Level "Radio", game "CoBaCoLi"

Step 1: shoot straight into the wall next to you 2-3 times to make the white ball small enough to fit the gap. You might shoot 1-2 times more to fit in the gap above. It's easier to complete the rest of the level if you choose soloution nr. 2.

Step 2: Shoot the white ball on the blue ball to the right. This is more luck-based if you chosed to go in the lower gap.

Step 3: When you've cleared the 2nd blue ball, go into the opening available. If both, I'd leave the one on the top. Because it's so much harder too get out of when you need to clear the last ball.

Step 4: Now you've got only one ball left. Now just simply clear it and there you go, ready to play more levels :D