Sudoku Friend Challenge

Sudoku for iPhone with zero ads. It works fully offline. Turn on Training Mode and tap any digit: every matching number lights up, and their rows, columns and boxes are shaded, so you can see where each number can still go. When you're ready, send a friend a link and race the same board.

Training Mode
• A free switch in Settings
• Tap a digit to light up every match and shade its rows, columns and boxes
• Leave it off for a plain board

Play your way
• Classic: rows, columns and boxes
• Diagonal: both main diagonals must also hold 1–9
• Daily Challenge: one puzzle a day, with a streak
• Time Attack: earn stars for speed and accuracy

Challenge a friend
Finish a puzzle and send a link. Your friend opens it on their iPhone, sees your time to beat, and plays the same board. No accounts needed.

Built for focus
• Easy, Medium and Hard
• Notes, undo and hints, and you can keep going after a mistake
• Light, dark and calm board themes
• Game Center leaderboards and achievements (optional)
• Works offline, great on flights

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