黑板數獨

Ting-Yao Hsu

Contains adsIn-app purchases

About this game

Step into the classroom and sharpen your mind with Blackboard Sudoku — the classic number puzzle game reimagined on a nostalgic school blackboard.

🖊️ CHALK-STYLE PUZZLE EXPERIENCE
Solve Sudoku puzzles on a beautifully crafted dark green blackboard. Every number you write sends a burst of chalk dust across the board, while erasing leaves a satisfying smudge cloud. With chalk-scratch sound effects and a school bell ringing on victory, every puzzle feels like a lesson worth solving.

📚 THREE DIFFICULTY GRADES
Choose your challenge level, just like picking a school grade:
• Grade 1 (Easy) — Perfect for beginners warming up their logic
• Grade 3 (Medium) — Sharpen your deduction skills
• Grade 6 (Hard) — Master-level challenge for seasoned solvers

🏅 WIN WITH STYLE
Complete the board correctly and earn a glorious red "A+" stamp — just like getting full marks on a test. Track your best completion times and win streaks on your personal Report Card.

🎯 SMART HINT SYSTEM
Every game includes free hints to get you unstuck. Each hint fills a random empty cell with the correct answer and locks it in permanently — highlighted with a burst of golden chalk dust so you always know where help came from.

❤️ FORGIVING GAMEPLAY WITH COIN ECONOMY
Three mistakes and class is dismissed — but Chocolate Coins let you fight back:
• Buy an extra mistake allowance mid-game to keep going
• Stock up on extra hints that carry across sessions
• Revive instantly after a game over if you have coins to spare

📝 NOTE MODE
Toggle Note Mode to pencil candidate numbers into cell corners — the same strategy real Sudoku experts use to crack hard puzzles.

⏱️ TIMER & PAUSE
A live timer tracks your solving speed. Pause anytime with a full blackboard overlay that hides the puzzle — no peeking — and resume exactly where you left off.

📊 REPORT CARD (Transcript)
Review your puzzle-solving history with a detailed report card: best times per difficulty, total wins, mistakes made, and hints used. A complete record of your classroom performance.

🛒 WELFARE STORE (welfare club)
• Chocolate Coin packs — fuel for extra hints and lives
• Remove Ads — enjoy an uninterrupted puzzle session with a one-time purchase

🌐 BILINGUAL SUPPORT
Fully localized in Traditional Chinese (繁体中文) and English. Language auto-detects from your device or can be switched in Settings at any time.

📴 OFFLINE & FREE TO PLAY
No internet connection required. Play during commutes, breaks, or anywhere you want to keep your brain sharp. The game is free with optional ads, or go completely ad-free with a single purchase.

Blackboard Sudoku is the perfect blend of classic puzzle mechanics and nostalgic classroom charm. Whether you're a Sudoku novice or a seasoned number cruncher, class is always in session.

What’s new

Android Alpha build 2026-07-18

- CI: Fix pre-commit using old node.js 20 issue (0c897b7)