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.

Go to Property

Medium Sudoku

Mid-difficulty Sudoku requiring candidate notation.

Medium Sudoku with ~32 starting clues. The standard Sudoku rules apply: fill every blank cell with 1–9 so each row, column, and 3×3 box contains every digit exactly once. Expect to scan and do light candidate elimination.

Part of: Daily Challenges

Play first; notes and related practice are below
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How to use

  1. The three rules: each row, each column, and each 3×3 box must contain every digit 1–9 exactly once.
  2. Tap a blank cell and press 1–9 to enter a digit (Backspace/Delete/0 clears).
  3. Start with naked singles (only one legal digit fits the cell), then scan digit-by-digit for hidden singles — a digit that can go in only one cell of a given row, column, or box.
  4. Red highlight means a rule was broken. Uniqueness is guaranteed, so there is always a logical next step — no guessing needed.

Examples

Medium difficulty
≈ 30 clues, typical solve 7–15 minutes.

Before you judge the score

Treat the score as feedback on one short practice round. It may reflect speed, attention, memory, or familiarity with the format, not overall ability.

The best next step is to review one missed pattern or one slow decision, then try a related practice or guide.

Next up

Medium clean? Step up to hard.Hard Sudoku → Want a different logic puzzle? Try pattern matching.VibeMatch →

Frequently asked questions

› What techniques work at this level?

Single candidates, hidden singles, and basic box/line interactions usually suffice.

› Is mental note-taking enough? Trust & accuracy

Usually yes. For the trickier cells, pencil-marks on paper can help until pencil-marks ship in the app.

Tips & related reading

See the Daily Challenges hub →

Tips & how-tos

Relevant links

Related tools

Sudoku

Play Sudoku in your browser. Easy, medium, hard, and expert boards. Auto-save progress.

Easy Sudoku

Play easy Sudoku in your browser. About 36 given clues — ideal for beginners or a quick puzzle.

Hard Sudoku

Play hard Sudoku in your browser. Around 26 clues — requires chains, pairs, and patient elimination.