Call of Cthulhu vs Fear of the Unknown
Compare Call of Cthulhu and Fear of the Unknown side by side. See differences in complexity, dice, genre, and more.
| Call of Cthulhu | Fear of the Unknown | |
|---|---|---|
| Genre | Horror, Modern | Horror |
| Tags | Investigation, Fear & Stress Mechanics, Mystery, Deadly, Corruption, Skill-Based, Atmospheric, One-Shot Friendly, Character-Driven, Narrative | Tag-Based, Fiction-First, Collaborative, Investigation, Mystery, Fear & Stress Mechanics, One-Shot Friendly, Rules-Light |
| Core Mechanic | Roll d100 equal to or below a skill or characteristic. Hard and Extreme tests use half and one-fifth of that rating. Bonus and penalty dice select a better or worse tens digit. Eligible failed skill rolls can be pushed by taking further action, risking a harsher consequence. | Roll 2d6 and add tags: invoke up to three of your character's tags for +1 each, while the Oracle invokes up to two against you for -1 each. On 10+ you fully succeed, on 7-9 you succeed at a cost, and on 6 or less the Oracle chooses a consequence. The Encounter True Horror move instead adds your accumulated Horror to the roll, where a higher total is worse, so encounters grow more dangerous as dread builds. |
| Dice | d100 | 2d6 |
| Complexity | Medium | Low |
| Availability | Free quickstart | Free quickstart |
| Runnability | 5 of 5 book tools | 5 of 5 book tools |
| License | Chaosium Fan Material Policy | Proprietary |
| Third-Party Publishing | Commercial publishing allowed — Community content program | Not yet researched |
| Summary only, not legal advice. Check current terms before publishing. | ||
| Publisher | Chaosium | Sixpence Games |
| Year | 2014 | 2023 |
| Languages | English, French, German, Italian, Japanese, Korean, Spanish, Polish, Portuguese, Russian, Swedish, Chinese | English |
| Best For | Groups who want clue-driven horror with ordinary investigators and lasting consequences. Suits focused mysteries and campaigns where survival matters more than defeating every threat. | Groups who want a rules-light collaborative horror mystery that plays to completion in a single session, especially fans of horror films who want to investigate a mystery and face escalating dread without any GM prep. Works well for convention one-shots and players new to narrative RPGs. |
| Highlights | Pushing a failed roll offers another chance at the goal with a more serious consequence if it fails. Learning Mythos lore reduces maximum Sanity, tying useful knowledge to lasting vulnerability. An Idea roll gets a stalled investigation moving again, with failure putting investigators into danger. | Every successful Investigate roll hands the player a clue tied to the question they asked, so the mystery advances from what characters do at the table rather than from clues the Oracle hid in advance. The tags a player invokes on a roll become the fictional elements of the resulting scene, so each character's specific traits, not just the dice result, shape what happens in play. Each supernatural encounter permanently raises a character's Horror, which is added to future horror rolls, building escalating dread without a separate countdown. |
| Considerations | A major wound can leave an investigator dying, making direct confrontation dangerous. Bouts of madness temporarily place investigator actions under Keeper control. Foot and vehicle chases track relative speed and movement actions, adding a separate procedure to pursuit scenes. | A single Face Peril roll resolves every dangerous situation, from a fistfight to a fall, with no initiative or enemy stats, so groups wanting tactical combat must build it themselves. The Oracle prepares no clues and improvises every answer to investigation questions live, which demands real on-the-spot creativity rather than prepared structure. The three-act structure and epilogue are built for self-contained one-shots, with no advancement loop for ongoing characters beyond gaining and losing tags. |