SumDoku | HTML5 Game

SumDoku — A Fresh Spin on Sudoku

SumDoku takes the logic puzzle you already know and adds one new rule: every row and column must not only avoid repeating numbers — it must also add up to the exact same total. Simple to learn, satisfying to master, and built as a single self-contained HTML5 file with zero build tools and zero dependencies.

✨ Key Features

• 3 difficulty levels — Easy (4×4), Medium (5×5), Hard (6×6)
• Separate screens — Start Menu, How to Play, Settings, and Game, each with its own clean layout
• In-game pause menu — Resume, Restart Level, Sound toggle, Home
• Hint system — 3 free hints per round reveal hidden row/column sums, plus a rewarded-ad flow to earn more (simulated ad included, real ad SDK integration documented in one line)
• Web Audio sound effects — every tap, placement, mistake, and win is a synthesized tone; no audio files to load
• Win celebration — confetti animation and an animated win modal
• One-tap social sharing — native mobile share sheet, X/Twitter, WhatsApp, Facebook, and copy-to-clipboard
• Fully responsive — mobile-first layout that scales cleanly from small phones to desktop
• Bold neobrutalist visual style — thick borders, offset shadows, bright accent colors, easy to re-theme via CSS variables
• Single HTML5 file — drop it on any host, wrap it in Cordova/Capacitor, or embed it anywhere

Built For Developers

• Clean, commented vanilla JavaScript — no framework, no build step
• Full documentation included: customizing colors, fonts, difficulty curve, hints/ads, sounds, and sharing text
• One clearly marked function for plugging in a real rewarded-ad SDK (AdMob, Unity Ads, IronSource, etc.)

Compatibility

Chrome, Firefox, Safari, Edge, Opera, and their mobile equivalents (iOS Safari, Chrome for Android, Samsung Internet). Built with HTML5, CSS3, and ES6 JavaScript.

What’s Included

• index.html — the complete game
• documentation.html — full setup & customization guide
• changelog.txt

Support

Questions or requests? Leave a comment on this item page and I’ll get back to you.