Sudoku Star: Ad-Supported

Sudoku game optimized for serious Sudoku players! Check out our reviews:
"Best Sudoku. Best one out there. Great game play."
"Best? Yes it is! I've played my share of sudoku games, and this one tops them"
"Hands down, this is the best sudoku implementation on the iPhone."
"The best iPhone Soduku game there is. Intuitive and easy to learn user interface, with all the the right features and functions."
"Best Sudoku on any computer. This is the best Sudoku that I have seen for any computing device."
"This is the best sudoku! I love sudoku and I downloaded and paid for a lot of different sudoku games, but this is the only one I kept on my iPhone and the only one I've kept playing. Thanks for doing such an awesome job on this game!"
"Now try the best. Tried/bought numerous 'top-rated' Sudoku apps and they all have something to offer; this is the one I actually play. Wish I would have found this one earlier."
"Great Sudoku for iPhone! The best iPhone Sudoku game there is."
"Wow. Believe the reviews. Sudoku Star is that good."

Platform:
• Universal app for iPhone + iPad, iOS 15 or later
• Optimized for all iPhone and iPad screen sizes

Basics:
• Unlimited number of games, five doubly-graded levels of play
• Symmetric games with unique solutions
• Six built-in color schemes + dark mode
• Built-in solver
• Autosave and restore of game in progress
• Game stats: wins, best/average times, percentile, trend, mistakes

Gameplay automation:
• Both automatic and manual pencil marks
• Integrated, graduated hint system
• Bookmarks stack for trial-and-error backtracking

Visualization:
• Optional color-coded errors
• Optional color-coded conflicts
• Optional highlighting of selected digits and marks
• Digits done feedback

Great user interface:
• Both digit-first and cell-first entry
• Large, easy-to-read digits
• Unlimited undo and redo, undo to last correct
• No pop-up entry menus covering board
• All key features accessible from main screen
• Optimized to maximize playability
• Respects your privacy, collects no data linked to you