2023 · ソースブック（プレイを拡張するルール／オプション）
Worlds of Atomic Horror
A GURPS supplement for running retro-futuristic science-fiction and horror campaigns set in alternate Cold War-era worlds. It presents four alien groups with distinct technologies, methods, templates, and statistics, along with organizations, five linked alternate worlds, and detailed setting histories. The book also includes mutation tables, ideas for time machines and experimental transformations, and references to inspirational films, television, games, and other media. It supports campaigns involving nuclear technology, alien influence, monsters, and the chrome-tech future imagined by early science fiction.
スキルベース（スキルを購入または獲得）ポイント制（ポイントを割り振ってスキルや能力を得る）ダイス（主にd6）
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。