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Achtung! Cthulhu 2d20

Player Resources Hub

"Punch evil in the tentacles."

Welcome, agent. This is your dossier of field materials for Achtung! Cthulhu 2d20 — Modiphius's pulp-horror roleplaying game set in the Secret War behind World War II.

Below you'll find the consolidated player manual, individual reference documents, and the original Quickstart PDFs. No adventure spoilers — this is player-facing material only.

Consolidated Manual

All-in-one · HTML

Player Field Manual

The full player-facing compendium in one page — Part I Agent's Briefing, Part II full System Reference, Part III all 20 Pregenerated Agents.
~128 KB · single HTML · printable

Individual References · 3 HTML DOCS

HTML

Agent's Briefing

Setting, factions, how the game works, quick rules primer, character concept, and table etiquette. The friendly introduction.
~28 KB · read me first
 HTML

2d20 System Reference

Complete mechanics: tests, Momentum, Threat, Fortune, Truths, combat, stress and injuries, weapon effects, magic.
~33 KB · deep reference
 HTML

Pregenerated Agents

All 20 pre-built characters (15 from the Agent Pack + 5 from Quick Trip to France, plus Crook the dog). Full stats, talents, spells, equipment.
~74 KB · 20 sheets

Original Quickstart PDFs · OFFICIAL MODIPHIUS

PDF · Official

Operation Basic Rules

The official 24-page Quickstart rulebook. Full-colour layout, illustrations, and all core mechanics. Source of everything in the HTML references.
106 MB · 24 pages · Modiphius 2024
 PDF · Official

Quick Reference Sheets

2-page double-sided cheat sheet with all common tests, combat actions, Momentum/Threat spends, and weapon effects. Print for the table.
14 MB · 2 pages · v2
 PDF · Official

Agent Pack

The official 21-page character pack: 15 pregenerated agents with full-page sheets, art, and equipment. Print-ready alternative to the HTML version.
16 MB · 21 pages · v004
Note: The two adventure Quickstart modules (A Quick Trip to France, Operation Kindling) are intentionally not hosted here — those contain GM-facing spoilers. Ask your GM if you need them.