Sudoku Solving Checklist (Use Every Puzzle)

A short checklist creates consistency, and consistency creates better solve times.

Before You Start

• Take 10 seconds to identify the most filled rows/columns/boxes.
• Commit to scan order: rows, columns, boxes.
• Avoid guessing in first phase.

Main Solve Loop

• Place naked singles.
• Find hidden singles.
• Apply candidate eliminations in constrained regions.
• Repeat full scan.

When You Get Stuck

• Re-scan from top-left.
• Check box-line interactions.
• Add candidates only where needed.
• Validate previous placements for errors.

Before You Finish

• Check every row has 1-9 once.
• Check every column has 1-9 once.
• Check each 3x3 box has 1-9 once.

Post-Game Notes (30 Seconds)

Write one line: what slowed you down today? Keep this log in Sudoku One9x sessions to spot repeated issues.

Checklist Scoring Method

Turn this checklist into a 10-point quality score. Give yourself points for each step completed: scan discipline, singles pass, candidate cleanup, elimination pass, final validation, and post-game note. This turns vague improvement into measurable improvement.

• 8-10 points: clean process, keep same routine.
• 5-7 points: stable, but refine one weak step.
• 0-4 points: simplify and rebuild fundamentals first.

Why Scoring Works

Most players only track solve time. Time hides process problems. A checklist score exposes where you lose efficiency. Run this method in Sudoku One9x and review weekly trends.

Printable Version Idea

If you prefer consistency, keep this checklist next to your screen or notebook and tick each step once per puzzle. Physical checkmarks reduce skipped steps under time pressure and help build automatic solving discipline.

Checklist for Timed Games

In timed mode, shorten each pass instead of skipping passes. A short disciplined loop is usually faster than rushed random placement.