Cthulhu Mythos tabletop RPG

Biodata

Feature	Value
Name	Cthulhu Mythos tabletop RPG Game Hall
Original Name	克苏鲁跑团游戏
Alias(es)	The Real Cthulhu TRPG
Type	Dedicated Cthulhu Mythos tabletop RPG platform
Status	Active; its SAN Value Check rules receive a major update during the Harvest Festival scenario 49
First Appearance	Chapter 1

Appearance

The Game Hall initially appears as a desktop application marked by an icon of Cthulhu. Its registration sequence manifests a black hole and a Cthulhu avatar before opening the main interface 1 2.

• Interface borders are decorated with “Forgiveness Green” tentacles and skeletons 2.
• Registration success is displayed as bloody text after the Cthulhu avatar dissolves 2.
• A synthesized young female voice provides system notices, rules explanations, and game-start announcements 2 3.
• A mobile version with the same functions later appears on registered players’ phones 7.

Areas and Difficulty

Area	Difficulty	Notes
Ghoul Area	Simple	The only unlocked area for a new player; includes the Novice Room 2
Shoggoth Area	Intermediate	Advancement destination following qualification matches from the Ghoul Area 2 41
Hound of Tindalos Area	Advanced	Named after a creature that hunts those who traverse time 2
Cthulhu Area	Epic	Named after Cthulhu, a major deity among the Great Old Ones 2
Azathoth Area	Hellish	The highest listed area, named after Azathoth, the origin of all things in the Mythos system 2

Game System

Registration and Points

• The Hall requires identity information and a phone number, but no separately chosen account password is described 2.
• New registrants receive 10 points, which Liu Xing immediately exchanges for ¥100,000 2.
• Points can be used for shop purchases, materializing eligible items in reality, and extending time before a player must enter another game 7 9 39.
• Uninstalling the Hall costs 10,000 points 3.

Character Cards

Each player may possess multiple Character Cards. A card records a character’s attributes, skills, equipment, spells, relationships, and progress for scenarios with a similar historical setting 3.

• A Character Card is lost when its user dies or is eliminated during a scenario 3.
• A player who loses all Character Cards is erased 3.
• A novice’s first card is generated from their performance in the Novice Room 3 6.
• Liu Xing receives an additional card as the twenty-second newcomer to earn an A-level novice evaluation 6.
• Intermission Growth allows surviving cards to improve or alter attributes and skills between games 26 39.

Objectives and Hidden Content

• Every scenario includes a Main Objective and Branch Objectives, with potential Hidden Branches and Hidden Main Quests 3.
• Hidden objectives offer greater benefits but carry mortality rates several times—or even dozens of times—higher than the main objective 3.
• Completing the Novice Room’s side quest earns Liu Xing an A-level evaluation, 50 points, and an Old Seal Amulet 6.
• Completing a hidden ending at Ains Castle grants Liu Xing MVP status, 120 points, relationship-network rewards, and skill growth 36.

Meta-gaming Restrictions

Players may not reveal the Game Hall to NPCs or act beyond the current scenario’s historical background 3.

Violation	Penalty
First meta-gaming offense	All points are deducted and one attribute point is randomly deducted 3
Second meta-gaming offense	The Character Card used in that scenario is lost 3

Sanity and Knowledge

SAN Value represents a character’s sanity. Encounters with corpses, Mythical Creatures, magic, and supernatural events can require SAN checks; reaching zero SAN results in permanent insanity, equivalent to death 4.

• Large SAN losses in a short period can trigger Temporary Insanity 4.
• Spells, magic books, and Eldritch Seals may offer protection, but their use can cost sanity 3.
• Cthulhu Mythos Knowledge is usually gained through encounters with Mythical Creatures, Mythical Items, or Mythical Events; SAN loss and knowledge gained are generally equal, though exceptions exist 20.
• A system update removes the usual Inspiration Check prerequisite for SAN checks; Inspiration thereafter primarily serves clue acquisition and danger detection except in special events 49.

Keepers

Keepers (KPs) host scenarios, narrate outcomes, and handle skill checks. Players can communicate with a Keeper by silently calling their designation, such as “004” 12.

• Lawful good KPs guide players and provide correct information when needed 47.
• Chaotic evil KPs exploit their authority to mislead players without openly breaking the rules 47.
• KP004 is characterized by a twisted sense of humor but can offer useful advice, including warnings about language barriers in higher areas 12 26.
• kpcao identifies himself as a troublemaker KP and deliberately leads players toward lower-reward routes 42 47.

Items and Rewards

• Old Seal Amulet — A low-quality Old Seal crafted by a human with some Mythos knowledge; effective against low-tier Mythical Creatures and materializable in reality for one point 7.
• SAN-restoring green tea — Restores 1d6 SAN up to three times and has a 50% chance to end a madness state 9.
• Cthulhu’s Candy — A 999-point item drawn from a Newbie Gift Pack; its unspecified “unexpected result” makes Liu Xing unwilling to use it casually 9.
• Qingming Oiled Paper Umbrella — Has a 50% chance to make Mythical Creatures ignore its user for 2d6 minutes, then burns away; the duration is shorter against higher-level creatures 41.
• Qingming Season Rain — A throwable item capable of damaging Mythical Creatures immune to physical attacks 41.
• Qingming Sacrifice — Can substitute for sacrifices required by rituals, preventing failures caused by missing ritual components 41.

Story Role

The Game Hall contacts Liu Xing through a desktop advertisement promising ¥100,000, automatically installs itself, and draws him in as a player after registration 1 2.

Liu Xing enters the Ghoul Area’s Novice Room, where the Hall establishes its core rules: Character Cards function as lives, hidden quests bring both rewards and elevated danger, and players who lose all cards are erased 3. His A-level completion earns him points, an Old Seal Amulet, and an extra Character Card 6.

Afterward, the Hall expands into Liu Xing’s real life through its mobile application, item materialization system, guild interface, and enforced game schedule 7 10. It later grants Intermission Growth opportunities and requires Liu Xing to enter best-of-three Advancement Matches for promotion to the Shoggoth Area 39 41.

During the Harvest Festival Advancement Game, the Hall updates its SAN-check rules while the players are trapped in the Mirror World, fundamentally changing the value of Liu Xing’s exceptionally high Inspiration 49.

Notable Quotes

“I hope you can come back alive.” — the synthesized system voice before Liu Xing’s first game 2

“The less you know, the longer you live. Good luck.” — the Game Hall’s final novice-rule warning 3