( This is a placeholder for introductory information about block wargames. No sense in writing that stuff from scratch if we can get permission from sos1 to take his text from http://www.panix.com/~sos/bc/columbia.html )
What is a block wargame
A 'block game' is a type of war game in which each unit is represented by a small square block. The block stands on edge with the unit information facing its owner and a blank side facing the opponent. Thus, each side the where units are located, but not what kind of units and not their strength. This limited intelligence is commonly called "fog-of-war," and in some important respects it simulates the confusing and lack of information in real warfare.