Raku Sudoku is now available in six languages – English, French, German, Spanish, Japanese and Korean.

• Game Center is now optional. You can now turn Game Center on or off in the menu. New players start with it off for a distraction-free experience. Existing players keep their setup — toggle it anytime under Settings. Your scores are always preserved.

• Improved error highlighting • Better feedback when completing puzzles • Settings discoverability improvements • Bug fixes

This update includes performance improvements and minor refinements to ensure a smoother, more reliable Sudoku experience.

• Reworked difficulty analysis and scoring system • Ludicrous (17-clue) puzzles re-evaluated using deeper solve metrics • Outliers removed to ensure consistent challenge • Improved variation between consecutive puzzles Behind the scenes, puzzles are now ranked using more precise solving complexity metrics — not just clue count — for a more reliable difficulty experience.

This update refines puzzle difficulty across all levels: • Better progression between difficulty levels • More consistent challenge within each level • Subtle refinements to the overall solving experience Thank you for playing Raku Sudoku.

· No ads, no subscription. · Legendary 17-clue grids by Math Professor Gordon Royle. · Now possible to turn always error correctness on and off

· No ads, no subscription. · Legendary 17-clue grids by Math Professor Gordon Royle. · Improved notes features · Now possible to turn mistake limit on and off

· New and improved Ludicrous level! · Legendary 17-clue grids by Professor Gordon Royle. · No ads, no subscription. · New icon design!

· New and improved Ludicrous level! · Legendary 17-clue grids by Professor Gordon Royle. · No ads, no subscription.

· We’ve added a new Ludicrous level! · Legendary 17-clue grids by Professor Gordon Royle. These ludicrous puzzles are some of the hardest Sudokus ever created, made by Professor Gordon Royle. A huge thank you to Mr Royle for making this extraordinary level possible.

· We’ve added a brand-new level: Ludicrous! · New 17-clue grids by Professor Gordon Royle.  These ludicrous puzzles are some of the hardest Sudokus ever created, made by Professor Gordon Royle. A huge thank you to Mr Royle for making this extraordinary level possible.

· Legendary 17-clue puzzles by Professor Gordon Royle.  Get ready for the ultimate challenge! We’ve added a brand-new difficulty level: Ludicrous. These 17-clue puzzles are some of the hardest Sudokus ever created, made by Professor Gordon Royle. A huge thank you to Gordon for making this extraordinary level possible.

• Design and performance enhancements

· Improved stability and bug fixes.

· The Insane level just got a major upgrade – it’s now more challenging than ever! Plus, we’ve made a few tweaks and fixes to keep everything running smoothly. Good luck!

· We’ve made several improvements to enhance your experience, including bug fixes, performance optimizations, and minor UI updates. Thank you for your continued support and feedback!

· A little maintenance, a lot of love. Everything’s smoother now.

· Improved stability and bug fixes.

· Improved stability and bug fixes.

· Improved stability and bug fixes.

Now integrated with Game Center! – Compete against yourself and friends – Scoreboard for all levels, easy to insane Fine-tuning of the design

· Improved stability and bug fixes.