Free-play offers many different experiences in-game. I had a Formica rufa colony on ramp with spikes and attack waves. I turned the nest invasions off. At one point when I had an army of 30 ants, I needed to travel half-way across the map to a poppy plant. Then I needed to take control of two that were near and far away from my nest because it died. Really great experience and has a lot of potential for new levels.