Cepheus Engine vs Mothership
Compare Cepheus Engine and Mothership side by side. See differences in complexity, dice, genre, cost, and more.
| Cepheus Engine | Mothership | |
|---|---|---|
| Genre | Scifi | Scifi, Horror |
| Play Style | Sandbox, Modular, Toolkit, Simulation | Rules-Light, Deadly, One-Shot Friendly, Survival, Atmospheric, Low-Prep, Cinematic, Fast-Paced |
| Core Mechanic | Roll 2d6 + skill level + characteristic modifier. Meet or beat 8 to succeed. Effect (margin above/below 8) determines degree of success or failure. Lifepath character creation with careers, skills, and mustering-out benefits. | Roll d100 under stat/skill. Stress and panic mechanics escalate tension. |
| Dice | 2d6 | d100 |
| Complexity | Medium | Low |
| Accessibility | High | High |
| Community | Medium | Medium |
| License | OGL | 3rd Party License |
| Cost | Free | $ |
| Publisher | Samardan Press | Tuesday Knight Games |
| Year | 2016 | 2022 |
| Best For | GMs who want a fully open, hackable classic sci-fi engine for sandbox campaigns — trade, exploration, and space combat without any IP restrictions. | Terrifying sci-fi horror one-shots and short campaigns. Panic table creates unforgettable moments. |
| Highlights | Completely free and OGL, large third-party ecosystem, comprehensive rules covering personal combat to starship design, fully compatible with classic Traveller material | Rules-light, well-regarded module library, panic system creates mechanical tension |
| Considerations | Dense 200+ page SRD with no setting or adventure content, lifepath character creation can kill characters before play, assumes GM comfort with sandbox prep | Panic table can cascade and end sessions abruptly, limited long-campaign support in core rules, stress mechanics can feel repetitive over extended play |