Is Nine the same as sudoku?

It uses the classic 9×9 number-place rules (often called sudoku): every row, column and 3×3 box contains 1–9 once.

Do the puzzles need guessing?

No. Every puzzle has one solution and is checked to be solvable by logic alone.

A hint costs 30 seconds and explains the next logical step — the technique and the cells involved — before you apply it.

Can I stop and come back?

Yes. Your current game is saved on this device and resumes where you left off.

Nine

The timeless 9×9 number-place puzzle (sudoku-style), redesigned for phones: fast number pad, notes and auto-notes, undo, optional mistake check, and hints that name the technique and highlight the cells instead of just filling a square. Every puzzle has exactly one solution and is solvable by pure logic. Your game resumes where you left it.

Play Nine — free, no download.

What makes it different

Hints that teach: they name the technique (naked single, hidden single, pointing pair, pair) and highlight the cells instead of just filling a number.
Every puzzle has exactly one solution and can be solved by pure logic — no guessing.
Fast phone input: big number pad with remaining counts, notes, auto-notes, undo, optional mistake check.
Same-board race: send the exact puzzle and difficulty to a friend.

How to play

Tap a cell, then tap a number. Each row, column and 3×3 box needs 1–9 once.
Notes mode pencils in candidates; Auto notes fills them for you.
Hint (+30 s) explains the next logical step — tap Apply to use it.
Mistakes are shown in red (+10 s each). Fastest total time wins.

Controls

Touch: Tap a cell, then a number
Desktop: Click a cell, type 1–9 · arrows to move · Backspace to erase

Questions

Is Nine the same as sudoku?: It uses the classic 9×9 number-place rules (often called sudoku): every row, column and 3×3 box contains 1–9 once.
Do the puzzles need guessing?: No. Every puzzle has one solution and is checked to be solvable by logic alone.
How do hints work?: A hint costs 30 seconds and explains the next logical step — the technique and the cells involved — before you apply it.
Can I stop and come back?: Yes. Your current game is saved on this device and resumes where you left off.

If you like Nine

Grid Paint — Paint by logic. A pixel creature appears when you solve it.
Sweep — Mine logic with zero luck. Every board is solvable without guessing.
Beamline — Flip mirrors. Mix light. Light every crystal.
Beamline Studio — Build a light puzzle. We prove it's solvable. Friends play it.