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<p style="font-size:16px;color:#666;margin-bottom:30px">JavaScript is required to play Suirodoku, the free online color sudoku game with 81 unique number-color pairs.</p>
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<h1 style="position:absolute;width:1px;height:1px;padding:0;margin:-1px;overflow:hidden;clip:rect(0,0,0,0);white-space:nowrap;border:0">Suirodoku – Free Online Color Sudoku Game</h1>
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<!-- DISCOVER SECTION - SEO optimized static content -->
<section class="discover-suirodoku" id="discover-suirodoku">
<div class="discover-hero">
<p class="discover-tagline"><span data-i18n-discover="hero_tagline_1">Sudoku was the training.</span><br><span class="discover-tagline-bold" data-i18n-discover="hero_tagline_2">Suirodoku is the real game.</span></p>
</div>
<div class="discover-section discover-what-is">
<div class="discover-content">
<h2><img src="/assets/emoji/emoji-grille.svg" alt="" class="discover-emoji emoji-title" width="48" height="48"> <span data-i18n-discover="what_is_title">What is Suirodoku?</span></h2>
<p data-i18n-discover="what_is_text">Suirodoku is a free online color sudoku game that merges numbers and colors into a single puzzle. Each cell combines a number (1-9) and a color (among 9), creating an entirely new brain training experience where both dimensions are intertwined. This innovative logic puzzle creates 81 unique number-color pairs.</p>
</div>
<div class="discover-image">
<img src="/assets/images/what-is-suirodoku-320.webp" srcset="/assets/images/what-is-suirodoku-320.webp 320w, /assets/images/what-is-suirodoku-600.webp 600w" sizes="320px" alt="Color sudoku grid showing 81 unique number-color pairs in Suirodoku game" class="discover-img discover-img-square" loading="lazy" decoding="async" width="320" height="320">
</div>
</div>
<div class="discover-section discover-rules reverse">
<div class="discover-content">
<h2><img src="/assets/emoji/emoji-cible.svg" alt="" class="discover-emoji emoji-title" width="48" height="48"> <span data-i18n-discover="rules_title">4 Rules, 1 Ultimate Challenge</span></h2>
<p data-i18n-discover="rules_intro">Suirodoku adds a revolutionary 4th dimension to classic Sudoku:</p>
<ul class="discover-rules-list">
<li><span class="rule-icon">→</span> <span data-i18n-discover="rule_line">Each <strong>row</strong> contains numbers 1-9 and all 9 colors</span></li>
<li><span class="rule-icon">↓</span> <span data-i18n-discover="rule_column">Each <strong>column</strong> contains numbers 1-9 and all 9 colors</span></li>
<li><span class="rule-icon">▦</span> <span data-i18n-discover="rule_region">Each <strong>3×3 region</strong> contains numbers 1-9 and all 9 colors</span></li>
<li><span class="rule-icon">★</span> <span data-i18n-discover="rule_color">Each <strong>color</strong> contains numbers 1-9 (the 4th rule!)</span></li>
</ul>
<p class="discover-cta"><a href="/tutorial/" class="discover-link"><span data-i18n-discover="cta_tutorial">Learn how to play Suirodoku</span> →</a></p>
</div>
<div class="discover-image">
<img src="/assets/images/4-rules-320.webp" srcset="/assets/images/4-rules-320.webp 320w, /assets/images/4-rules-600.webp 600w" sizes="320px" alt="4 rules of color sudoku: row, column, region and color constraints" class="discover-img discover-img-square no-shadow" loading="lazy" decoding="async" width="320" height="320">
</div>
</div>
<div class="discover-section discover-pairs">
<div class="discover-pairs-top">
<div class="discover-content">
<h2><img src="/assets/emoji/emoji-aimant.svg" alt="" class="discover-emoji emoji-title" width="48" height="48"> <span data-i18n-discover="pairs_title">81 Unique Pairs</span></h2>
<p data-i18n-discover="pairs_text">Unlike traditional Sudoku where each number appears 9 times, Suirodoku guarantees that each number-color combination is <strong>unique</strong>. A completed grid is a harmonious work with no repetition - the ultimate logic puzzle challenge.</p>
</div>
<div class="discover-image">
<img src="/assets/images/81-pairs-320.webp" srcset="/assets/images/81-pairs-320.webp 320w, /assets/images/81-pairs-600.webp 600w" sizes="320px" alt="81 unique number-color pairs showing all combinations in color sudoku" class="discover-img discover-img-square no-shadow" loading="lazy" decoding="async" width="320" height="320">
</div>
</div>
<div class="discover-highlight"><div class="highlight-item"><img src="/assets/emoji/emoji-carte-as-pique.svg" alt="" class="discover-emoji emoji-highlight" width="32" height="32"><span data-i18n-discover="pairs_highlight_cells">81 cells.</span></div><div class="highlight-item"><img src="/assets/emoji/emoji-carte-as-coeur.svg" alt="" class="discover-emoji emoji-highlight" width="32" height="32"><span data-i18n-discover="pairs_highlight_combinations">81 combinations.</span></div><div class="highlight-item"><img src="/assets/emoji/emoji-carte-as-trefle.svg" alt="" class="discover-emoji emoji-highlight" width="32" height="32"><span data-i18n-discover="pairs_highlight_duplicates">0 duplicates.</span></div><div class="highlight-item"><img src="/assets/emoji/emoji-carte-as-carreau.svg" alt="" class="discover-emoji emoji-highlight" width="32" height="32"><span data-i18n-discover="pairs_highlight_solution">1 solution.</span></div></div>
</div>
<div class="discover-section discover-techniques full-width">
<h2><img src="/assets/emoji/emoji-eclair-jaune.svg" alt="" class="discover-emoji emoji-title" width="48" height="48"> <span data-i18n-discover="techniques_title">Exclusive Techniques</span></h2>
<p class="discover-techniques-intro" data-i18n-discover="techniques_intro">Master advanced sudoku strategies that exist nowhere else:</p>
<div class="discover-techniques-grid">
<div class="discover-technique-card">
<h3 data-i18n-discover="rainbow_title">Rainbow Technique</h3>
<p data-i18n-discover="rainbow_text">Track each number across all 9 colors to identify the missing color. <strong>The number reveals the color.</strong><br>A revolutionary sudoku solving strategy.</p>
<a href="/articles/rainbow-technique.html" class="technique-img-link"><img src="/assets/images/rainbow-technique-400.webp" srcset="/assets/images/rainbow-technique-400.webp 400w, /assets/images/rainbow-technique-600.webp 600w" sizes="400px" alt="Rainbow technique for solving hard color sudoku puzzles" class="discover-img-small" loading="lazy" decoding="async" width="400" height="267"></a>
<a href="/articles/rainbow-technique.html" class="technique-link"><span data-i18n-discover="rainbow_link">Learn more</span> →</a>
</div>
<div class="discover-technique-card">
<h3 data-i18n-discover="chromatic_title">Chromatic Circle</h3>
<p data-i18n-discover="chromatic_text">Track each color across all 9 numbers to identify the missing number. <strong>The color reveals the number.</strong><br>An advanced brain training method.</p>
<a href="/articles/chromatic-circle-technique.html" class="technique-img-link"><img src="/assets/images/chromatic-circle-400.webp" srcset="/assets/images/chromatic-circle-400.webp 400w, /assets/images/chromatic-circle-600.webp 600w" sizes="400px" alt="Chromatic circle method for difficult sudoku challenges" class="discover-img-small" loading="lazy" decoding="async" width="400" height="267"></a>
<a href="/articles/chromatic-circle-technique.html" class="technique-link"><span data-i18n-discover="chromatic_link">Learn more</span> →</a>
</div>
</div>
<p class="discover-cta"><a href="/articles/" class="discover-link"><span data-i18n-discover="cta_articles">Read all strategy guides</span> →</a></p>
</div>
<div class="discover-section discover-comparison full-width">
<h2 data-i18n-discover="comparison_title">Sudoku vs Suirodoku</h2>
<div class="comparison-grid">
<div class="comparison-card comparison-sudoku">
<h3 data-i18n-discover="sudoku_name">Sudoku</h3>
<ul>
<li><span class="check-icon">○</span><span data-i18n-discover="sudoku_point_1">3 constraints</span></li>
<li><span class="check-icon">○</span><span data-i18n-discover="sudoku_point_2">Numbers only</span></li>
<li><span class="check-icon">○</span><span data-i18n-discover="sudoku_point_3">Each number repeated 9 times</span></li>
<li><span class="check-icon">○</span><span data-i18n-discover="sudoku_point_4">Classic techniques</span></li>
</ul>
</div>
<div class="comparison-vs"><span>VS</span></div>
<div class="comparison-card comparison-suirodoku">
<h3 data-i18n-discover="suirodoku_name">Suirodoku</h3>
<ul>
<li><span class="check-icon">✓</span><span data-i18n-discover="suirodoku_point_1">4 constraints (+ colors)</span></li>
<li><span class="check-icon">✓</span><span data-i18n-discover="suirodoku_point_2">Numbers AND colors intertwined</span></li>
<li><span class="check-icon">✓</span><span data-i18n-discover="suirodoku_point_3">81 unique pairs</span></li>
<li><span class="check-icon">✓</span><span data-i18n-discover="suirodoku_point_4">Exclusive techniques</span></li>
</ul>
</div>
</div>
<p class="discover-cta"><a href="/leaderboard/" class="discover-link"><span data-i18n-discover="cta_leaderboard">Join global rankings</span> →</a></p>
</div>
<section class="discover-section discover-faq full-width" id="faq" aria-labelledby="faq-title">
<h2 id="faq-title" data-i18n-discover="faq_title">Frequently Asked Questions</h2>
<div class="faq-list">
<details class="faq-item">
<summary data-i18n-discover="faq_q1">What is Suirodoku?</summary>
<div class="faq-answer">
<p data-i18n-discover="faq_a1">Suirodoku is a color sudoku where each cell combines a number (1-9) and a color (9 colors), creating 81 unique number-color pairs.</p>
</div>
</details>
<details class="faq-item">
<summary data-i18n-discover="faq_q2">What are the rules of Suirodoku?</summary>
<div class="faq-answer">
<p data-i18n-discover="faq_a2">Like Sudoku, each row/column/3×3 region must contain numbers 1-9. In addition, each row/column/region must contain all 9 colors, and each color must contain numbers 1-9.</p>
</div>
</details>
<details class="faq-item">
<summary data-i18n-discover="faq_q3">Is Suirodoku free to play?</summary>
<div class="faq-answer">
<p data-i18n-discover="faq_a3">Yes. You can play Suirodoku for free online in your browser.</p>
</div>
</details>
<details class="faq-item">
<summary data-i18n-discover="faq_q4">What are Rainbow and Chromatic Circle techniques?</summary>
<div class="faq-answer">
<p data-i18n-discover="faq_a4">Rainbow tracks a number across all 9 colors to find the missing color. Chromatic Circle tracks a color across all 9 numbers to find the missing number.</p>
</div>
</details>
</div>
</section>
</section>
</div>
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