221B Baker Street: The Master Detective Game

AI-friendly board game rules summaries — use with Claude, ChatGPT, or any AI assistant

Overview

221B Baker Street: The Master Detective Game is a deduction board game where each player assumes the role of Sherlock Holmes. Players move around a map of Victorian London, visiting locations to gather clues that help solve a mystery case. The first player to deduce the correct answers and return to 221B Baker Street wins. Cases involve identifying elements such as the killer, weapon, and motive.

Components

Setup

  1. Each player selects a token and places it at 221B Baker Street on the board.
  2. Each player takes 1 Skeleton Key card and 1 Scotland Yard card.
  3. Place remaining Scotland Yard and Skeleton Key cards at their designated locations on the board.
  4. Each player obtains a Solution Checklist sheet and a pen or pencil.
  5. One player takes a Case Card and reads the adventure aloud — read once quickly, then again more slowly.

Turn Structure

  1. Roll the die to determine who goes first (highest roll). Play proceeds clockwise.
  2. On each turn, a player rolls the die and moves their token that many spaces in any direction (except diagonally).
  3. Upon arriving at a location, the player may look at the clue for that location in the Clue Booklet. Players have up to 30 seconds to study a clue and must look at only the clue they are entitled to see.
  4. Players record clue information on their Solution Checklist.
  5. When a player believes they have solved the case, they must return to 221B Baker Street via normal turns and rolls.

Actions

Movement

Reading Clues

Using Scotland Yard Cards

Using Skeleton Key Cards

Carriage Depot

Scoring / Victory Conditions

  1. A player must return to 221B Baker Street via regular turns and die rolls.
  2. The player announces their solution to all lettered items on the Case Card (e.g., a) killer, b) weapon, c) motive).
  3. The player does NOT need to explain the full intricacies of the case — only give correct answers to all items.
  4. If correct: that player wins the game.
  5. If incorrect: that player is eliminated from the game. Remaining players continue playing.

Special Rules & Edge Cases

Player Reference

Turn Sequence:

  1. Roll die → Move token
  2. Enter location → Read clue (30 sec max) → Record notes
  3. Optionally play Scotland Yard card when leaving a location
  4. When ready: return to 221B → Announce solution

Special Locations: | Location | Effect | |—|—| | Carriage Depot | Free movement to any location (no die roll needed) | | Scotland Yard | Pick up replacement Scotland Yard card | | Locksmith | Pick up replacement Skeleton Key card | | 221B Baker Street | Starting point; must return here to announce solution |

Card Usage: | Card | Use | Cannot Seal | |—|—|—| | Scotland Yard | Seal a location entrance | 221B, Scotland Yard, Locksmith | | Skeleton Key | Unlock a sealed location | — |