01
Guides
Work a case from the first statement to a supported arrest.
8 field guides
An independent fan guide to Dupery
The Dupery case library
Field guides that turn a clue into a plan, role files that say what an ability can and cannot prove, and one careful address calculator.
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Role files
What each ability proves, where it misleads, and what it never decides.
12 role files
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Address calculator
Test which address sets fit the announced sum, under your stated assumptions.
Runs in your browser
Case tool
The Mathematician address calculator
A sum is a clue, not a verdict. Enter the addresses in your case, add only the constraints you can support, and compare matching sets before you accuse anyone.
Runs locally in your browser. Your case inputs stay in your browser.
One of the four address sets that fit 1–6 with a target of 7.
Field guides
All 8 guides01
Beginner guide: work a case without guessing
Start a Dupery case, separate observed statements from assumptions, choose useful investigations and avoid unsupported arrests.
02
Truth, lies and taint: can you trust a clue?
Understand unreliable information in Dupery, why good roles can lie, and how to test a clue before using it as a constraint.
03
Alignment, categories and disguises explained
Separate good or evil alignment from Innocent, Meddler, Underling and Traitor categories, and understand what a disguise changes.
04
How to use a Dupery Mathematician sum
Work through the four address sets that sum to seven, narrow them with independent clues, and interpret zero or unique conditional results.
05
Arrests and reputation: when to commit
Decide whether an arrest is supported, account for Critic and other modifiers, and avoid treating a clue’s evil label as a verdict.
06
Board notes: keep evidence separate from guesses
Use pins, strings and a simple note legend to track statements, assumptions, changing information and address-sum constraints.
Role files
Search all 12 rolesMathematician
what the address sum means
On investigation, reports an address total for roles counted as evil.
Drunkard
a good role with a false clue
Lies under the disguise of a good role absent from the case.
Wannabe
good alignment behind an Underling display
Copies a tainted, revealed Underling display from an in-play role; the Demo description also says an in-play Underling is revealed.
Fall Guy
counted as evil is not the same as evil
Is treated as an evil Underling by other roles; cannot be another role’s disguise target.