Significant special rules and/or units; often highly customized; often (but not always) uses many map boards, overlays, and/or markers; generally, longer in duration (4-plus hours).

 Minimal special rules and/or units; usually (but not always) uses fewer map boards, overlays, and/or markers; generally, of shorter duration (.5-2 hours); often designed for beginners or those with a limited time to play.

 Some special rules and/or units; often (but not always) uses many map boards, overlays, and/or markers; generally, of average duration (2-4 hours).