CR 3.0 is a skirmish set of rules that can be played with any figures you may already have. CR 3.0 is a great way to learn the Reaction System used in over twenty products by Two Hour Wargames. It streamlines and updates the previous 2.0 rules and brings them more in line with the many present day THW products. CR 3.0 is essentially a THW lite version given to the gamer at no cost. 28 pages plus 6 pages of charts.