Frontier Logic

Daily case

Frontier Logic Daily No. 47 October 21, 2026 Rookie

The Chalk Flat Incident: a free Western logic-grid puzzle

The trouble at Chalk Flat reached the territorial paper before it reached the sheriff, which tells you something. The territory expects an answer by sundown.

This free Rookie logic-grid puzzle has 4 suspects, 4 locations, and 4 pieces of evidence. New to logic grids? Start with the pencil-solving guide.

How to mark the grid

●
These two belong together.
✕
These two are ruled out.
blank
Still undecided.
How to play

Click, tap or press Enter on a cell to cycle it: blank, then ● for a confirmed pairing, then ✕ for one you have ruled out. Nothing fills itself in — the deductions are yours to make. Use the arrow keys to move around the grid.

Fill obvious Xs does the bookkeeping only: for each ● you have marked, it crosses off the rest of that pairing's own row and column. It never adds a ●, never reads a clue, and never changes a mark you made.

On a narrow screen the grid scrolls sideways.

Every case has exactly one solution, and it is always reachable by deduction alone. Nothing here guesses for you, and Check will not tell you which mark is wrong.

Clues and evidence

  1. The sheared kingbolt came off Isham Cobb, and there's no arguing it.
  2. Two witnesses put the snapped fiddle string in Merritt Kyne's hands.
  3. No one puts Silas Wren at Wheeler Siding.
  4. Isham Cobb was nowhere near Wheeler Siding.
  5. Silas Wren swore never to have set foot in Last Trail, and the ledger agrees.
  6. Silas Wren stayed well away from Muleshoe Spring.
  7. Silas Wren never laid hands on the broken strongbox hasp.
  8. Nobody saw Isham Cobb anywhere near Last Trail.
  9. You can rule out Wheeler Siding for Merritt Kyne.

The grid

On a narrow screen the grid scrolls sideways.

Your marks, completions and streak are saved in this browser only. There is no account, and clearing your browser data clears that local progress. If you accept analytics, the site sends anonymous puzzle-usage events; it never sends your grid marks, clues or solution.

If you want a hundred more

Five volumes, printed and portable

Each Frontier Logic volume collects 100 western mystery logic-grid puzzles, every one with exactly one solution and a complete answer key. Every volume stands alone, in standard and large print.

Opens Amazon, who sell the books and set the final price.