A free edition, including most of the game text is available on the author's web site.

The free edition has fully functional features but is restricted to 20 nodes.

No attempt is made in the free edition to adjust the division points to occur during a period of silence.

Here's a sample from the essay accompanying that free edition:

There's also a free electronic edition available there.

There is also a free electronic edition with a different title: .

- New behavioral analysis engine in the free edition.

In addition there are two free editions that can be trialed for an unlimited period.

On 27 April 2012 there was a minor update 5.2 which included many new features, a free edition, and an updated licensing model.

As of 2.0 there is no free edition.