2005 · 资料书（用于增强玩法的规则/选项）
Attacks of Opportunity
This 13-page PDF explains how attacks of opportunity function in d20 fantasy combat and provides ideas for using the mechanic more effectively. It helps Game Masters add tactical depth to encounters by encouraging players to consider the consequences of movement and other actions during combat. The material is designed to integrate easily into existing d20 campaigns.
技能型（购买或获得技能）基于属性/数值（STR、CON、PER 等）等级制（获得经验值并升级）
免费，支持网页、Android 和 iOS
用 Ludoya 玩 Attacks of Opportunity
游戏信息（人数、游戏时长、年龄、制作人员）来自 BoardGameGeek。