You solve a Net puzzle when you arrange the numbers on the arrows so that numbers on all arrows entering each node are (strictly) less than numbers on all the arrows leaving that node.

How to arrange the numbers

There are two ways you can arrange the numbers on the arrows:

Only swapping the numbers

To swap numbers between two arrows, you select the number on one arrow and select the number on the other arrow.

Moving the numbers from the boxes to the arrows then swapping them

You can move all the numbers to the boxes below the puzzle by clicking the Clear button.

Then you can move each number to an arrow by first selecting that number in the box and select the empty hole on the arrow of your choice.

When is an arrow red or black?

Each arrow has a nock-node and a head-node.

An arrow is black if the numbers on all the arrows entering the nock-node are less than the number on that arrow and the numbers on all the arrows leaving the head-node are greater than the number on that arrow. Otherwise, that arrow is red.

As you move closer to solving a puzzle, more arrows will turn black, and more arrows will turn red as you move away from solving the puzzle.

All the arrows will turn green when you solve the puzzle.