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 Companion
This rules supplement expands play in the BattleTech universe with additional skills, traits, advanced weather rules, and systems for managing noble landholds and organizations. Players receive updated life-path character creation rules, an alternate point-based method, and rules for designing battle armor. Gamemasters gain guidance for running adventures, using contacts and enemies, incorporating underworld organizations, and creating creatures, including examples of alien fauna.
スキルベース（スキルを購入または獲得）属性／ステータス制（STR、CON、PERなど）ダイス（主にd10）
ゲーム情報（人数、プレイ時間、対象年齢、クレジット）の出典：BoardGameGeek。