Cohors Cthulhu vs Achtung! Cthulhu: Which Cthulhu Game to Choose?

Quick answer

Choose Cohors Cthulhu if you want dark, sword-and-sorcery action in a mythic ancient world powered by the 2d20 system. Choose Achtung! Cthulhu if you want a World War II fight against the Mythos with pulpy heroes and a well-supported campaign line. Both share cosmic horror DNA, but they deliver very different tables, tones, and prep loads.

Both games carry the Cthulhu name, but they ask you to run very different tables. Cohors Cthulhu puts you in a mythic ancient world where soldiers and heroes face horrors that predate history, while Achtung! Cthulhu drops you into a World War II secret war against the Mythos. The right pick depends on the era you want to play, the system your group already knows, and how much published support you need to start.

This comparison uses the supplied catalog facts and the core design of each line to show where they diverge. It is not a review of either game, and it does not rank them. Instead, it explains the trade-offs so you can decide which one earns a place on your shelf and at your table.

Setting and tone: ancient mythos versus WWII pulp

Cohors Cthulhu is set in a mythic ancient world where the Hidden War is fought against unknown horrors. The tone leans toward dark fantasy and military action, with heroes taking up arms against things that should not exist. Achtung! Cthulhu, by contrast, is a World War II game where Allied agents battle the Mythos alongside Axis threats. Its tone is pulpy and adventurous, with room for larger-than-life heroes, secret bases, and weird science.

That difference matters at the table. Cohors Cthulhu supports campaigns about holding a line against cosmic dread in a pre-modern world, while Achtung! Cthulhu supports missions, espionage, and military operations in a familiar 20th-century frame. If your group loves history with a supernatural twist, Achtung! Cthulhu has the edge. If you want a fresh, mythic setting where you build the lore as you play, Cohors Cthulhu is the stronger fit.

• Pick Cohors Cthulhu for ancient-world campaigns with swords, shields, and hidden horrors.
• Pick Achtung! Cthulhu for WWII missions with vehicles, radios, and pulp heroics.

System and mechanics: 2d20 in both, different focus

Both lines use the 2d20 system, so players who know one will recognize the core mechanic in the other. That shared engine means the learning curve between them is short. The difference is in how the system is tuned: Cohors Cthulhu emphasizes martial combat and survival against supernatural threats, while Achtung! Cthulhu emphasizes investigation, infiltration, and fighting a secret war.

If you are searching for an Achtung! Cthulhu 2d20 review, you are likely already comfortable with 2d20. The same comfort carries over to Cohors Cthulhu. The trade-off is that neither game is a rules-light pick-up-and-play experience; both reward players who enjoy tactical choices and character builds. If your group prefers lighter, narrative-first horror, you may want a different Cthulhu game entirely.

• 2d20 veterans can move between the two games with minimal relearning.
• Neither is a one-page ruleset; expect a session or two to settle in.

Support and accessories: dice, screens, and starter options

Cohors Cthulhu has dedicated accessories that reinforce its identity. The Cohors Cthulhu RPG Hidden War Dice Pack includes two twenty-sided dice with the Hidden Wars symbol on the 1 face, and four six-sided dice with damage results on the 1 and 2 faces and the Hidden Wars symbol on the 5 and 6 faces. That is a focused, thematic dice set for players who want the game's symbols at the table.

Achtung! Cthulhu has a broader published line, including a starter set and multiple campaign books. If you want a low-prep entry point, the Achtung! Cthulhu starter set is the easier on-ramp. If you want a self-contained mythic game with its own dice and a distinct look, Cohors Cthulhu is the more curated package. Neither approach is better; they simply serve different appetites for published material.

• The Hidden War Dice Pack is optional but useful if you like physical dice that match the game's symbols.
• A starter set reduces prep; a core book plus dice gives you more control over the campaign.

Cohors Cthulhu Tactics vs RPG: what the name means

If you have seen Cohors Cthulhu Tactics, know that it is a separate miniatures game, not the roleplaying game. This comparison focuses on the Cohors Cthulhu RPG, which uses 2d20 and is played with books, dice, and a Game Master. The tactics game is for players who want ranked battles and measured movement on a tabletop.

That distinction matters when you search for a Cohors Cthulhu review. Make sure you are reading about the RPG if you want character-driven campaigns, and about Tactics if you want competitive or scenario-based miniatures play. Buying the wrong one is an easy mistake, and the two do not substitute for each other.

• Cohors Cthulhu RPG: 2d20, characters, campaigns, Game Master.
• Cohors Cthulhu Tactics: miniatures, scenarios, tabletop battles.

Trade-offs at a glance

• Setting era: Cohors Cthulhu is mythic ancient world; Achtung! Cthulhu is World War II. Pick the era your group will actually show up for.
• System familiarity: Both use 2d20, so skills transfer; neither is rules-light. If you already play 2d20, either is easy to adopt.
• Published support: Achtung! Cthulhu has a starter set and a broad campaign line; Cohors Cthulhu is newer with a focused accessory set. Choose Achtung! Cthulhu for more ready-made material; choose Cohors Cthulhu for a tighter, self-contained line.
• Miniatures versus RPG: Cohors Cthulhu Tactics is a separate miniatures game, not the RPG. Confirm which product you are buying before you check out.

Product facts that matter for your decision

• Cohors Cthulhu RPG Hidden War Dice Pack: Contains two twenty-sided dice with the Hidden Wars symbol on the 1 face, and four six-sided dice with damage results on the 1 and 2 faces and the Hidden Wars symbol on the 5 and 6 faces. If you play the Cohors Cthulhu RPG, these dice put the game's symbols in your hand and reduce table lookups during play.
• Fallout: The Roleplaying Game Winter of Atom Book: A quest book for Fallout: The Roleplaying Game set in a nuclear winter in old Boston, featuring the Church of the Children of Atom. Not a Cthulhu product, but a useful comparison point: if your group prefers post-apocalyptic survival over cosmic horror, this is a different direction entirely.
• The Elder Scrolls: Call to Arms - Vampire Core Set: A miniatures core set featuring Lord Harkon, Orthjolf, and three vampires for The Elder Scrolls: A Call to Arms. Relevant if you are weighing miniatures games like Cohors Cthulhu Tactics against RPGs; this shows the kind of self-contained warband box you get in a miniatures line.
• Infinity: Shadow Affairs Campaign: A campaign book for Infinity where players join an eclectic base and try to make it a competent force before the enemy interferes. Another example of a campaign-focused product; useful if you want a structured campaign rather than an open sandbox.

Which Cthulhu game fits your table?

Best for

• Groups that want a mythic ancient-world campaign with martial action and cosmic horror.
• Players who already know 2d20 and want a new setting with dedicated dice.
• GMs who prefer a focused line with fewer books to track.

Not for

• Groups that want a WWII historical frame with pulpy missions and a starter set.
• Players who prefer rules-light, narrative-first horror without tactical combat.
• Anyone looking for a miniatures game rather than a roleplaying game.

If you want ancient-world dread and a self-contained 2d20 game, go with Cohors Cthulhu. If you want WWII pulp heroics and a deep published line, go with Achtung! Cthulhu. Either way, confirm whether you are buying the RPG or a miniatures product before you commit.