Sudoku

Sudoku - Play Online

Logic puzzle. Classic grid. Numbers only. Sudoku strips brain games down to pure deduction. 9x9 grid. 81 cells. Your mission? Fill every space without breaking the rules. No fluff. Just you vs. the numbers.

How to Play Sudoku

The Goal: Fill the entire 9x9 grid. Each row needs digits 1-9. Each column needs digits 1-9. Each 3x3 box needs digits 1-9. Zero repeats allowed. Some numbers are pre-filled. Use logic to crack the rest. Simple rules. Complex solutions.

The Core Mechanic

Click empty cell. Click number 1-9. That's it. Watch the highlights. Grid shows your active row, column, and 3x3 box in real-time. Black numbers? Static. Blue numbers? Those are yours. Track your progress by color. Hit Notes to pencil in possibilities without committing. Use it for tough cells where multiple options exist.

Difficulty Progression

Multiple levels waiting. Easy grids? More pre-filled numbers. Hard mode? Brutal gaps. Beware mistakes. System tracks errors. Three strikes and you're flagged. Master each tier before moving up. No shortcuts here.

Strategy Tips

Scan rows first. Identify missing digits. Cross-reference with columns. Eliminate impossible numbers. Focus on 3x3 boxes with the most pre-fills. Start there. Use Notes aggressively early on. Mark candidates in every tricky cell. Clear them as you solve neighbors. Never guess blind. Logic chains always exist.

Key Features

• Classic 9x9 Grid: 81 cells. Standard Sudoku rules. No gimmicks.
• Clean 2D Visuals: High-contrast black and blue text. Minimalist layout. Zero distractions. Runs on anything.
• Notes System: Pencil in multiple candidates per cell. Clear them as you narrow options.
• Multiple Difficulty Tiers: Easy to expert. Pick your pain level.
• Mistake Tracking: System flags errors. Stay sharp.

Who is Sudoku for?

Perfect for puzzle game fans. Brain training addicts. Great for 5-minute coffee breaks or hour-long deep focus sessions. No age limit. Just bring logic.

Release Date & Developer

Sudoku was developed by Sergey. Released in April 2025.

Controls

• Mouse Click: Select cell
• Number Keys (1-9): Input digit
• Notes Button: Toggle candidate marking mode