🧩 Sudoku Puzzle
Sudoku Puzzle is a free, browser-based online game with no registration required! Enjoy classic logic puzzles alongside innovative variations, detailed personal statistics, global leaderboards, and a community chat.

🌟 Key Features:
    🎯 4 Classic Difficulty Levels: Choose from Easy, Medium, Hard, or Expert modes tailored to your skill level.
    🎲 Diverse Game Modes:
        • X-Sudoku: Incorporates diagonal constraint rules.
        • Windoku: Introduces additional regional constraints on the grid.
        • Killer Sudoku: Requires cell groups to hit specified target sums.
        • Kropki: Features ratio and difference markers between adjacent cells.
    🧠 100% Pure Logic: Every puzzle has exactly one solution reachable without guessing.
    🏆 Competitive & Social: Track performance via leaderboards, view personal profile stats, and connect via community chat.

🎮 How to Play & Rules:

    🎯 Core Objective: Fill a 9×9 grid so that every row, column, and 3×3 box contains digits 1 to 9 without repetition.

    💡 Strategy & Solving Tips:
        • Start Small: Focus on cells with the most pre-filled neighbors to narrow down possible choices.
        • Chain Reactions: As choices narrow down, solve the puzzle through pure logical deduction.
        • Notes Mode: Jot down candidate numbers in cells and eliminate them as the grid populates (essential for Hard & Expert).

    🎲 Variant Rules:
        • X-Sudoku: Digits must also be unique along both main diagonals.
        • Windoku: Digits must be unique within additional highlighted 3×3 regions.
        • Killer Sudoku: Cell groups (cages) must add up to specified target sums.
        • Kropki: White dots indicate adjacent cells differ by 1; black dots indicate one cell is twice the other.