Frontier Logic

Daily case

Frontier Logic Daily No. 15 September 19, 2026 Rookie

The Deadfall Notch Incident: a free Western logic-grid puzzle

The sheriff has four riders, one afternoon at Deadfall Notch, and a stack of statements that cannot all be true. Take it a line at a time.

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. Two witnesses put Ottie Gaunt at Dutchman's Tank.
  2. Ottie Gaunt wasn't carrying the falsified assay slip.
  3. Powder Kate Dunn was never once placed at Deadfall Notch.
  4. Nobody saw Assay Bill Pardee anywhere near Copper Basin.
  5. Assay Bill Pardee stayed well away from Deadfall Notch.
  6. Powder Kate Dunn had no use for the falsified assay slip.
  7. You can rule out the falsified assay slip for Cornish Tom Trewin.
  8. Ottie Gaunt was never linked to the spliced bell rope.
  9. It wasn't Ottie Gaunt who turned up with the bent drill steel.
  10. Powder Kate Dunn had nothing to do with the spliced bell rope.

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.