2014 · ソースブック（プレイを拡張するルール／オプション）
When Worlds Collide: Converting Numenera and The Strange
This supplement provides guidance for combining the settings and rules of Numenera and The Strange. It explains how to transfer types, creatures, cyphers, descriptors, and foci between the two games while preserving their shared Cypher System framework. Both games use difficulty ratings, Effort, skills, assets, and d20 resolution, with characters described through a single sentence. The conversion tools support campaigns that borrow selected material from either setting or use both in full.
スキルベース（スキルを購入または獲得）特性／アスペクト制（性格がゲームプレイに影響する）属性／ステータス制（STR、CON、PERなど）
無料・Web、Android、iOS対応
LudoyaでWhen Worlds Collide: Converting Numenera and The Strange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。