Kefiw

Archived noindex page. Kefiw's public focus is Property decision help.

Archived page

This older Kefiw page is kept for reference, marked noindex, and removed from the primary sitemap. The current Kefiw experience is focused on property decisions: cost, quotes, damage, buying, selling, owning, and packets.

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How to Solve Sudoku Faster

The solving techniques that actually shave seconds off every puzzle.

Apply these in order and your Sudoku solve times drop by a third within a week.

Sudoku speed isn't about pattern recognition first — it's about scanning discipline. Pros sweep the grid in the same order every time, catching easy cells before looking for hard ones.

Quick answer

Apply these in order and your Sudoku solve times drop by a third within a week.

What you are trying to do
The solving techniques that actually shave seconds off every puzzle.
Best next step
Sudoku
Limit to remember
Treat this as a practical aid for the task, not a replacement for professional judgment.

Key points

  • ▸ Always start with naked singles: cells where only one digit fits. Clear every naked single before looking deeper.
  • ▸ Then hidden singles: a digit that can only go in one cell of a row, column, or box. Scan digit-by-digit 1-9.
  • ▸ Pointing pairs: if a digit in a box can only be in two cells of one row, that digit is eliminated elsewhere in that row.
  • ▸ X-wings and swordfish are advanced — useful for hard puzzles, rare in easy/medium.
  • ▸ Pencil marks help for hard puzzles but slow you down on easy ones. Don't use them until you're stuck.
  • ▸ Work the most-constrained rows/columns/boxes first (5+ digits filled) — they yield singles fastest.

Examples

  • Naked single
    A cell with other digits 1,2,3,4,5,6,7,8 already in its row, column, or box — only 9 can go there. Fill immediately.
  • Hidden single scan
    Looking for 7 in box 3, and only one empty cell in that box can hold a 7 (others excluded by row/column 7s) — place it.
  • Pointing pair
    Box 1 has 3 only possible in r1c2 and r1c3. That means 3 cannot appear anywhere else in row 1 — eliminate from r1c4-r1c9.

When to use which tool

▸ Operational Thresholds
  • CYAN · STABLE — Naked and hidden singles still flowing — solve on pace.
  • GOLD · GUARDED — Stalled 60+ seconds — scan digit-by-digit for a missed hidden single.
  • MAGENTA · CRITICAL — Three minutes no progress or guessing — you missed a technique; rescan from box 1.
▸ Pivot
Sudoku stuck? Switch to a quick daily-word break and come back with fresh eyes.
Daily Word →

Related

Frequently asked questions

› What's a good solve time for a medium Sudoku?

Around 8-12 minutes for practiced players. Easy: 3-5 minutes. Hard: 15-25 minutes.

› Should I guess when I'm stuck? Troubleshooting

Only on evil-level puzzles. Well-designed puzzles have a logical path — if you can't find it, you're missing a technique.

› How should I use this guide with a Kefiw tool? How-to

Use the guide as the plan and the linked Kefiw tool as the check. Read the steps first, try the move manually, then use the tool to compare outputs, catch edge cases, and decide whether the result actually fits your task.

› What mistake do tool guides help avoid? Troubleshooting

Tool guides help avoid using a utility mechanically without understanding what you are trying to accomplish. Most word, writing, and text utilities are fast, but speed can hide context mistakes. Know whether you are solving a puzzle, cleaning copy, drafting a line, or checking a rule.

› Can a tool guide help me learn the skill? How-to

A tool guide can help you learn if you pause before accepting the output and ask why it worked. Compare your first guess with the tool result, look for the rule or pattern, and repeat that review. Passive copying solves one task; active review builds the skill.