One Key Too Many
Every door was locked. So why is there an extra key?
Your role
Evidence is a system. Read it like one.
Match cuts, registries, access permissions and custody to expose the unregistered duplicate.
First-case tutorial
What you actually do
- Pair the two checkout records for each key.
- Compare first return with second checkout.
- Find the overlap.
Formal rules
- One physical key cannot be held by two people at once.
- Times are exact.
Cases in this family rotate through multiple reasoning archetypes, so higher difficulty changes the deduction structure rather than simply adding more rows.
Duplicate CutAccess RouteMaster KeyReturn Log