Description

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