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Fifteen Smooth Rounded Rocks is an investigative horror game using the 7th Edition Call of Cthulhu rules. It uses mildly adapted material from Convicts & Cthulhu by Gillian & Engelhart. Its pace is slow, sweltering daylight horror and its duration of a one-shot rather than campaign length. Please note that as a horror game, characters may be killed, driven mad and/or eaten.

Investigators are residents of the foothills of the Blue Mountains in December 1813, the very fringe of the colony touching a vast and unknown landscape. The Governor has plans to move cattle into the less drought-hit lands across the mountains and possibly our investigators are considering moving, too. Certainly several survey teams are working on mapping the general vicinity now that crossing the peaks has been proved possible. Certain, too, that a team including a botanist distantly related to the Governor has failed to return: the small huddle of settlers in the shadows of the mountains only know something terrible has happened, some more intimately than others. Yet what did happen out there? Our seekers aim to find out.

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Content Guidelines

Fifteen Smooth Rounded Rocks is rated Mature and may contain sexual references, swearing, violence and nudity, all of which are expected to be handled in a mature fashion. It also contains background themes of colonisation, ecological adaptation and the nature of sanity and/or reality.

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RTJs should include a rough character concept, preferably name included; an indication of what drew you to the game; a paragraph of your typical in-game writing, and an idea of what kind of horror media you most enjoy.

Accepted RTJs may proceed to Rolling Up below.

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This message was last edited by the GM at 14:59, Sun 22 Dec 2019.

Roll 3d6 for:
Appearance (APP)
Constitution (CON)
Dexterity (DEX)
Power (POW)
Strength (STR)
Luck (starting Luck)

These are your fifth values; note them down then multiply them by 5 for your total values, then halve the total to determine half values. 'Average' falls in the 55-65 range for these stats.

Starting Sanity is equal to your total POW score, Magic the fifth score.

Roll 2d6+6 for:
Education (EDU)
Intelligence (INT)
Size (SIZ)

These are your fifth values; note them down then multiply them by 5 for your total values, then halve the total to determine half values. 'Average' falls in the 65-75 range for these stats.


Illiterate people are assumed to have gained practical rather than formal education. Let me know if your character can't read.

Older Investigators: Adding 10 years to your character above their EDU fifth value+6 will add 5 points to EDU. Characters of 50+ subtract 5 Attribute points from STR, CON, DEX or APP for each decade of age, starting at 50.

Optional: If you want a deeper involvement than average with the plot, please let me know, then subtract d8+2 from your SAN and take a boost of 20% to any one Skill.


Add STR & CON and divide by 10 (rounding down) to determine HP

If you have a copy of the rulebook, feel free to sort out your own MOV, db & Credit scores. If not, ask the Keeper.

Use your chosen occupational template to determine skill points available for Occupational Skills, then INTx2 to determine points to be used on Personal Skills. If you are desperately keen to play an occupation not listed in the templates, such as a serving convict, priest, or one of Murphy's helpers, see the Keeper.

Fill in backstory using the prompts provided on your character sheet.


Should you roll up a truly terrible stat or set of stats, the Keeper allows a single undeclared reroll for one or all stats; if things remain terrible, tell the Keeper and we'll sort it out.