You need to make the balls change positions with each other, but the actual act of guiding individual balls to the right hole shouldn't prove too challenging.

Make your moves carefully and keep track of what you're doing. This problem requires you to shift things about a great deal, so just be warned that hints alone won't get you through this one.

The shortest solution for this problem involves less than 30 moves, but in order to solve it that quickly, you need to manage the movement of multiple balls at once.

If you're having trouble, swallow your pride and try the easier solution where you only need to guide one ball at a time.

For puzzles like this, you best bet is to clump as many of the open spaces together as possible to give the ball you're guiding a larger space to move about.

Just don't get too obsessed with consolidating space or you might actually make things harder on yourself.