Sudoku World: Friend Challenge

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.