Sudoku World: Friend Challenge

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About this game

Same Sudoku. Same rules. Different solver.

Sudoku World turns a timeless logic puzzle into a fair friend challenge. Finish a board, share a
link, and let a friend play the same Classic or Killer Sudoku on their schedule. Compare score,
time, mistakes, and hints without needing a public profile.

FRIEND CHALLENGES BUILT FOR REAL LIFE

• Share one private link; your friend has seven days to play
• Choose whether teaching hints are allowed
• Play with no mistake cap or a three-mistake limit
• Compare both results under the same scoring rules
• Rematch whenever you are ready

RACE A PRIVATE GHOST

Turn on Ghost Race to see the challenger’s recorded pace move across the board. It shares cell
locations and timing only, never entered numbers, pencil notes, candidates, or the solution. The
final result stays hidden until the puzzle is finished.

DAILY PUZZLES AND WORLD JOURNEY

Build a Daily streak with fresh Classic and Killer boards, or catch up on the previous six days.
First wins earn Journey points that unlock eight destination-inspired themes.

12,000+ INCLUDED PUZZLES

Choose Fast, Easy, Medium, Hard, or Expert Classic Sudoku, plus Killer Sudoku from Easy through
Expert. Included boards remain available offline after initialization; friend challenges, account
continuity, notifications, rankings, and Journey awards require a connection.

TOOLS FOR A THOUGHTFUL SOLVE

• Pencil notes, unlimited undo, and auto-save
• Teaching hints that explain the next logical step
• Optional auto-check and duplicate highlighting
• Personal statistics, best times, and progress

BUILT FOR FOCUS AND CHOICE

Play as a guest, or optionally link Google or Facebook to continue supported progress. Rewarded ads
are optional, and full-screen ads never interrupt a puzzle in progress. Review available advertising
consent controls from Settings → Privacy choices. Delete your Sudoku World account and synced data
directly from Settings whenever you choose.

Whether you are protecting a Daily streak, learning a technique, or settling a friendly rematch,
Sudoku World gives every solve somewhere to go.

Ratings and reviews

This had been my favorite Sudoku app for ages but this new redesign has completely ruined it! So sad.

This is for. the 'killer Sudoku" version. I was so happy to find that if I used the "notes button" it didn't keep my last number and put it in on the next block I highlighted. On several OTHER Sudoku game makers this has given me an error. Also, the level of game you choose is more accurate than others. Another plus is I can see all the numbers, even the total for an area WITHOUT my glasses or a magnifier!!! THANK YOU.

Only 2 stars because the Sudoku-puzzle is supposed to be the only difficult aspect of this app! Unfortunately, I also found my large hands, trying to navigate this small layout successfully, stole quite a bit of my concentration away from the puzzle. Super friggen annoying when you tap...tap...tap an "8", three times in a row, and a stink'n "9" appears!?!🤬🤯🤮😡... On the good side, 😇 you created a otherwise excellent product! Please, make it LARGER😕. God bless

What’s new

Improved Daily Challenge rankings and celebrations, with reliability and privacy improvements.