X vs Kirin Sudoku

X-Sudoku — Logic Puzzles Game Train your mind with the most elegant puzzle game on the App Store. X-Sudoku offers hundreds of hand-graded puzzles across two distinct variants, built for players from first-timers to seasoned solvers. Two Variants. One Obsession. Classic 9×9 — The timeless grid. Fill every row, column, and 3×3 box with the digits 1 through 9. Pure logic. No guessing required. X-Sudoku — An additional twist: both main diagonals must also contain all nine digits. 18 extra constraints. Entirely new strategies. Five Difficulty Levels From Easy (~10 min) to Epic (~45+ min), each difficulty unlocks as you progress. Whether you have a few minutes or a long commute, there's a puzzle for you. Earn Points. Climb Titles. Every solve earns points based on your speed, mistakes, and streak. Rise through 20 titles — from Student to Immortal. Daily Challenges A fresh puzzle every day. Solve it to earn bonus points. Keep a 7-day streak to double your daily rewards. Perks System Earn perks by solving puzzles: use a Hint to reveal a cell, Chance for an extra mistake, Forgive to wipe your record clean, or Double Points to maximise your score. Clean. Focused. No clutter. Elegant typography, a paper-toned palette, and smooth animations keep the focus on the puzzle. Visit our website for more information and our privacy policy: https://x-sudoku.com/privacy/

Kirin Sudoku is a clean, ad-free Sudoku app that works fully offline. Puzzles are generated on the fly inside the app, so there's always a fresh puzzle waiting — anytime, anywhere. ■ Nothing you don't need • No ads, no in-app purchases • No internet connection required — play in airplane mode • No account, no personal data collected ■ Unlimited puzzles • Standard 9×9 Sudoku generated on the spot, each with a guaranteed unique solution • Four difficulty levels: Easy / Normal / Hard / Expert ■ Comfortable play • Highlights the same row, column, box, and matching digits of the selected cell • Shows how many of each digit remain on the number pad • Pencil marks (notes), auto-removed when you place a digit (can be turned off) • Fill Notes: write candidates into every empty cell at once • Sweep: select a placed digit to clear it from the pencil marks in its row, column, and box • Unlimited undo / redo • Mistake highlighting: conflicting cells shown in red (can be turned off) • Save & Load: mark a position before trying a guess, then jump back with one tap • Auto-fill: near the end, when only a few cells remain and the answer is settled, fill them all at once ■ Progress and stats • Timer (can be hidden) • Completions, best time, and average time per difficulty • Auto-save: close the app and pick up right where you left off • Start the next game straight from the pause menu ■ Look and feel • Three themes: Giraffe (default) / Light / Dark, plus follow-system • Portrait and landscape, on iPhone and iPad • English / Japanese ■ How to play 1. Tap "New Game" and choose a difficulty 2. Tap a cell, then tap a digit on the number pad 3. Not sure yet? Switch to note mode with "Note" and jot down candidates 4. Fill every cell without conflicts to solve the puzzle! Sudoku is a logic puzzle: fill the 9×9 grid with digits 1–9 so that no digit repeats in any row, column, or 3×3 box. New to Sudoku? Start with Easy. Looking for a challenge? Try Expert. Feedback and bug reports: customer-hotline@lichtenlab.com Privacy policy: https://lichtenlab.com/kirin-sudoku/privacy/