Achtung! Cthulhu 2d20: Gamemaster's Guide is a roleplaying game manual that blends Lovecraftian horror with the chaos and heroism of World War II.

Suitable for ages 18 and up.

The manual is in English.

The Achtung! Cthulhu Player's Guide contains the full core cinematic 2d20 rules for actual play and you’ll require that to play the game. This guide provides dedicated advice on the art of gamemastering including managing the game economy and specific tips for creating memorable characters, adventures and campaigns to thrill and delight your players.

Major new lore and detailed background information on the six major factions contesting the Secret War: Section M, Majestic, Black Sun, Nachtwölfe, the Deep Ones and Mi-Go including their backgrounds, history, hierarchy, secret bases and missions and goals.

A vast repository of hidden lore and forbidden magical knowledge including new Mythos books and tomes, powerful ritualistic magic, plus the damnable spellbooks of Nyarlathotep, Yog-Sothoth and dread Cthulhu himself! Arm your players with a wealth of new weapons and espionage devices from secret government labs and classified research departments with the Secret Weapons of the Secret War chapter.

Complete profiles and statistics for the powerful heroes and villains of the Secret War, the men and women who do battle for the fate of mankind, plus a huge bestiary brimming with all the terrifying gods, monsters and entities of the Mythos themselves.