Frontier Logic

Daily case

Frontier Logic Daily No. 90 December 3, 2026 Rookie

The Cañón del Oso Notice: a free Western logic-grid puzzle

Nobody in the county will say plainly what took place at Cañón del Oso, so the deputy wrote down what could be proved and left the rest. 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 Ewell Crane at Cañón del Oso.
  2. Nobody saw Vance Pruitt anywhere near Hackberry Tank.
  3. The deputy struck the running iron off Windmill Sam Ordway's account.
  4. Windmill Sam Ordway swore off any connection to the torn tally book, and the ledger agrees.
  5. Nobody could connect Vance Pruitt to the torn tally book.
  6. Ida Lachlan kept well clear of La Ciénega.
  7. Vance Pruitt never laid hands on the bent mill wrench.
  8. It wasn't Ewell Crane who turned up with the torn tally book.
  9. The running iron wasn't Vance Pruitt's.
  10. You can rule out La Ciénega for Vance Pruitt.

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.