【CoC TRPG】鏡像のラボラトリ#Original

CoC TRPG: The Laboratory of Mirror Images

Cthulhu TRPG *Making a character sheet while playing*
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Published at 2026-03-23 | Updated at 2026-03-24

The Mirror's Laboratory
- The Mirror's Laboratory -


"When you awaken, you don't even know who you are."

The ultimate in dilapidated biotechnology, standing on a remote island.
You regain consciousness while immersed in cold culture fluid inside an inorganic capsule.

You can't remember your name. Your occupation, your past, your special skills – everything is "Unknown".

Every action you take will help you remember your physical and mental "specs".
Kicking down a door grants you memories of high STR (Strength), while deciphering wiring gives you memories of high INT (Intelligence).

★ Game Features

1. Real-time Character Building
Your declarations determine your stats.

2. Generative AI Dice
An experienced Keeper (KP) will determine your fate with a 1d100 roll. Success brings temporary respite, while failure plunges you into dire straits.

(It's heavily biased towards success, it's a rigged die no matter what...)

3. Profound Cthulhu Mythos
Forbidden experiments hidden on the island, and the creeping shadows of the异形 (otherworldly beings). Can you complete your "mirror image" of yourself and escape while your Sanity (SAN) erodes?

Creator's comments

You want a Cthulhu TRPG-style simulator, right?
But isn't making character sheets a pain? ⇒ That's right, a simulator where you can make character sheets while playing would be killing two birds with one stone! That's the idea behind this chatbot.
Even if you manage to finish, you'll probably be short on skill points, so after the ending, please add "Please adjust your skill points according to the play results and your abilities."

Creator's Play Result: After fostering a friendship with a completely unscripted, out-of-nowhere NPC, I heartbreakingly abandoned them and escaped alone END.

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