Minor UI optimization

UI improvements

New Features: 1. New Challenge Code system: Enter a 7-character code to jump right into a puzzle. Supports precise editing and auto-detection of codes in your clipboard. 2. Daily Challenges are here: Enjoy 6 variants including Classic, Killer, Arrow, and more. Track your progress with the new calendar view. 3. Save your stats and victory cards to your photo library with one tap.

What's New: Brand new Jelly design language, refreshing the entire interface. Experience more translucent card layers for a more comfortable immersive feel. Visual Upgrade: • Unified "Jelly Card" style across the app with more refined light and shadow • Four themes (Light/Dark/Eye Care/Retro) with optimized contrast for clearer text Gameplay Experience: • Classic 4×4/6×6 puzzles now feature more naturally balanced clue distribution • Killer Sudoku labels no longer overlap with notes for cleaner input • Victory screen adds star particle animation for a more ceremonial celebration

What's New: Expanded Puzzle Library & Difficulty Calibration This update brings a richer Sudoku experience: • Expanded puzzle library with more diverse challenges • Difficulty calibration—clearer progression curve, more accurate difficulty ratings • Guaranteed unique solutions, all solvable with human logic • Fixed rare cases where puzzles had multiple solutions Enjoy 9 Sudoku variants in one app: 4×4, 6×6, 9×9, Killer Sudoku, Diagonal Sudoku (Sudoku X), Jigsaw Sudoku, Sandwich Sudoku, Arrow Sudoku, Samurai Sudoku. From beginner to expert, everything you need. Perfect for training logical thinking and developing math skills—even young learners can have fun. Take on the new puzzles now!

What's New Gameplay Experience Improvements * Optimized number highlighting: selected cells and matching numbers now display in different colors—no more confusion * Hint feature now supports undo/redo, so you can use hints without worry * Samurai Sudoku board dragging is smoother, with more precise reset functionality * Board now scales in real-time with window size, adapting perfectly to both large and small screens Variant Sudoku Enhancements * Samurai Sudoku: added interactive instructions available in 17 languages, making it easier to get started * Arrow Sudoku: increased arrow count in Easy mode (12→15), more beginner-friendly; clue counts across difficulties are better balanced for more reasonable challenges Interface Polish * Removed complex background patterns from Jigsaw Sudoku boards; all Sudoku boards now maintain a unified, cleaner visual style * Tutorial page cards now support line breaks, so text no longer gets cramped * Dark mode comprehensively optimized: Jigsaw Sudoku hints are more visible, Samurai Sudoku background is more comfortable Bug Fixes * Fixed UI and interaction issues across multiple game modes * Improved overall stability and smoothness We value your feedback! If you enjoy this update or have any suggestions, feel free to leave a comment. Your input will help make Pure Sudoku even better!