Original monthly puzzle archive

Two clean grids. No episode spoilers.

Original exercises built from sequence, identity and elimination methods. They do not reproduce programme dialogue, graphics, props or case solutions.

How to mark a grid: use a tick for a match and leave or untick a square while testing possibilities. The solution stays closed until you choose to reveal it.

September 2026 · Standard

The three-room visit

One person visited each room at a different hour.

Clues

Ada arrived exactly one hour before the visitor to the Library.
Ben did not visit the Archive.
The Courtyard visit was at 11:00.
Cleo arrived at 10:00.

Question

Match Ada, Ben and Cleo to the Archive, Library and Courtyard, and to 09:00, 10:00 and 11:00.

Reveal solution and reasoning

Ada visited the Archive at 09:00; Cleo visited the Library at 10:00; Ben visited the Courtyard at 11:00. Cleo’s fixed time and the Courtyard’s fixed time leave Ada at 09:00. Ada’s one-hour-before clue then fixes the Library at 10:00.

Practice grid · Starter

The three folders

A second copyright-safe worksheet using persistent-object reasoning.

Clues

Farah handled the Notebook.
The Map was in the Blue folder.
Dora did not handle the Cipher card.
Elias handled the Red folder.
The Notebook was not in the Red folder.

Question

Match Dora, Elias and Farah to the Cipher card, Map and Notebook, and to the Blue, Green and Red folders.

Reveal solution and reasoning

Dora had the Map in Blue; Elias had the Cipher card in Red; Farah had the Notebook in Green. Farah fixes the Notebook, Dora’s clue leaves her the Map, and the Map clue fixes Blue. Elias’s Red clue then leaves Green for Farah.

Construction check

One solution only

Both grids were exhaustively checked against every permutation before publication. Each clue set produces exactly one complete solution.

Rights boundary

Method, not programme material

The grids use original names, objects, wording and layouts. They teach reasoning modes without recreating a transmitted case, prop or graphic.