2003 · ソースブック（プレイを拡張するルール／オプション）

Classic BattleTech Master Rules

A comprehensive rulebook for simulating 31st-century conflicts between BattleMechs, vehicles, infantry, artillery, air forces, and naval units. It combines core and advanced combat rules, including procedures for hostile environments and three-dimensional terrain. Players can create scenarios, assemble forces from Inner Sphere and Clan designs, and use the Battle Value system to evaluate units and balance opposing sides. The rules also cover a wide range of weapons and units introduced in technical readouts and field manuals.