I am having trouble with level 1-32 in puzzle mode. I know i'm probably…

Put the White ball between the Red balls in the bottom left of the screen to combine it with the previous line.
Change the Blue balls to Red, then shoot at them.
Shoot the Red balls between the White balls in the right of the screento completely remove the line.
Shoot at the Purple balls.
Shoot the Red balls between the White balls to remove the line.
Now SWAP and change the Red balls to White, and then shoot the final shot to complete the level.

Thank you ilovetrouble! Duh, it was so simple.