Optimized for serious Sudoku players!

Basics:
• Unlimited number of games, four levels of play
• Symmetric games with unique solutions
• Six built-in color schemes
• Built-in solver
• Autosave and restore of game in progress
• Game stats: wins, best/average times, percentile

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

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

Great user interface:
• Optimized to maximize playability
• Both digit-first and cell-first entry
• Large, easy-to-read digits
• All key features accessible from main screen
• Unlimited undo and redo, undo to last correct