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Free on iPhone, iPad & Android

Clear the fog.
Feel every hit.

Sudoku Life turns classic sudoku into a game that reacts to you: chain correct answers into combos, level up as you find your rhythm, blow away the fog that hides your numbers — and set the whole board on fire in Fever mode.

  • No sign-up
  • Built-in tutorial
  • Weekly leaderboard
  • English / 中文
An Easy board mid-combo with a COMBO burst over the filled cell
Fever mode on Hard: the screen turns red with a FEVER!! banner
Confetti and a PERFECT! banner as the board is solved

About

What is Sudoku Life?

Sudoku Life is a free sudoku game for iPhone, iPad and Android. It keeps the classic 9×9 rules and adds combos, difficulty that levels up as you play, fog that hides numbers and a Fever mode. Five correct answers in a row raise the level; each level-up hides some of your filled numbers under fog until you fill them back in; keep the combo going on Hard and the whole screen ignites. Every solved board gets an S–C grade based on mistakes and hints, and your score goes to a weekly leaderboard.

3 levelsEasy · Medium · Hard
set by how you play
15 cellsmax fog at once
fill to clear
5 comboon Hard
triggers Fever
S–Cno mistakes, no hints
earns the S stamp

Features

Five moments that make it feel alive

Every image below is real gameplay.

01 / COMBO

Every hit lands

Chain correct answers into combos that burst with light

Every correct cell throws out particles, a shockwave and a score pop. The longer the chain, the bigger the callout and the brighter the sound. One mistake breaks it — rhythm is your score.

  • Particles, shockwaves and COMBO callouts
  • Faster answers score more; every 5-combo adds a bonus
  • Sound effects for every big moment
Combo effect: sparks and a COMBO callout around a correct cell

02 / FOG

Clear the fog

Numbers vanish into mist — fill them back to blow it away

Each time you level up, 3–5 numbers you already placed roll under drifting fog (up to 15 at once). Use memory and logic to fill them back in — get it right and the fog blows away.

  • Fog rolls in from the edges and keeps moving
  • The right number clears it instantly
  • Tests memory as much as logic
A Medium board where several cells are hidden under fog, showing question marks

03 / FEVER

Enter Fever mode

Keep your streak alive at max level and the screen ignites

Once you reach Hard, a combo of 5 or more sends you into Fever: the background, progress bar and number pad all burn red. One wrong answer and the fire goes out.

  • Only on the top difficulty
  • Starts at a 5-combo, ends when the combo breaks
  • Full-screen flames and a FEVER!! banner
Fever mode: the Hard board and number pad turn red-orange

04 / FINISH

Finish in style

Every solved board ends with a celebration

Place the last number and confetti rains down, PERFECT! pops up and the board lights up cell by cell. Completing a whole row, column or box gets called out the moment it happens.

  • Board-complete celebration
  • Row, column and box callouts
  • A sound to match
PERFECT! and COMPLETE! celebration with confetti on a finished board

05 / GRADE

Earn your grade

A flawless run gets the S stamp

The results screen shows your total score, time, best combo, mistakes and hints — then stamps an S–C grade. Your score is sent to the weekly leaderboard automatically.

  • Total score and four game stats
  • S–C grade stamp
  • Automatic weekly leaderboard entry
Results screen with total score, an S grade stamp, time, best combo, mistakes and hints

How to play

Four steps to get going

The rules are classic sudoku. The difference is that the game moves with you.

  1. Pick a cell, place a number

    No 1–9 may repeat in any row, column or 3×3 box. Your first game comes with an interactive tutorial.

  2. Combo to level up

    Five correct in a row moves you up: Easy → Medium → Hard.

  3. Blow away the fog

    Leveling up hides some numbers under fog. Fill the right ones back in to clear it.

  4. Get graded, get ranked

    Finish the board for an S–C grade; your score joins the weekly leaderboard.

LEVEL 1

Easy

Every board starts here with the most numbers given — a warm-up to find your rhythm.

LEVEL 2

Medium

Reached with a 5-combo. The fog starts rolling in, and you never drop back to Easy.

LEVEL 3

Hard

The top level. Hold a combo of 5 or more here and Fever mode kicks in.

5 correct in a row → level up 45 s without a move → level down At least 2 min between level changes
S

0 mistakes
0 hints

A

≤ 2 mistakes
0 hints

B

≤ 5 mistakes
≤ 1 hint

C

Everything
else

FAQ

Frequently asked questions

Is Sudoku Life free?

Yes. Sudoku Life is free to download and play on the App Store and Google Play. It is supported by ads.

Which devices and languages does Sudoku Life support?

iPhone, iPad, and Android phones and tablets. The interface is available in English and Traditional Chinese.

What is the fog in Sudoku Life?

Every time the difficulty levels up, 3–5 numbers you already filled in are covered by drifting fog (up to 15 at once). Fill the correct numbers back in and the fog blows away.

How does the difficulty change?

Every board starts on Easy. Five correct answers in a row move you up one level: Easy, Medium, then Hard. 45 seconds without a move drops you from Hard back to Medium, with at least 2 minutes between level changes. Once you reach Medium you never drop back to Easy.

How do I enter Fever mode?

Reach Hard and keep your combo at 5 or more. The whole screen ignites; one wrong answer breaks the combo and ends Fever.

How do I get an S grade?

Solve the board with zero mistakes and zero hints for S. Up to 2 mistakes and no hints is A; up to 5 mistakes and at most 1 hint is B; anything else is C.

How is the score calculated?

Each correct cell is worth 15 points plus a speed bonus for answering quickly. Every 5-combo adds a combo bonus. A wrong answer costs 10 points.

When does the weekly leaderboard reset?

Every Monday at 00:00 UTC. All players start the new week from zero.

Do I need an account?

No. An anonymous profile is created the first time you open the app, with the nickname Player. You can change it to any 1–20 character name on the leaderboard screen.

Can I play offline?

Not at the moment. An internet connection is required to start a game.

I've never played sudoku. Can I still play?

Yes. The first launch includes an interactive tutorial that teaches the rules in three steps: no repeated 1–9 in any row, any column, or any 3×3 box.

Sudoku Life app icon

Today's first board
starts in the fog

Free to download. Open it and play.