2003 · ソースブック（プレイを拡張するルール／オプション）
Martial Arts Mayhem, Volume Two
A modern d20 System martial arts supplement that can be used on its own or alongside a first volume. It adds new martial arts schools, feats, secret techniques, and rules for martial arts weapons, including styles that incorporate psionics or magic. Three campaign models with nonplayer characters provide additional material for running martial arts-focused campaigns. Optional rules expand character and combat choices while maintaining the balance between firearms and martial arts in d20 Modern.
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）レベル制（XPを獲得してレベルアップ）
無料・Web、Android、iOS対応
LudoyaでMartial Arts Mayhem, Volume Twoを遊ぼう
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。