Sudoku

Sudoku - Play Online

This is classic Sudoku, no twists, no gimmicks—just pure number logic. If you've ever picked up a puzzle book on a flight or killed time with a newspaper puzzle, you know exactly what this is. Your goal is simple: fill the 9x9 grid so every row, column, and 3x3 box has the digits 1 through 9 with no repeats. It's brain training at its purest, designed for quick mental workouts.

Key Features

• Multiple Difficulty Levels: Start easy or jump straight into expert mode if you're confident.
• Notes System: Mark possible numbers in cells without committing—essential for harder puzzles.
• Mistake Tracking: The game warns you when you mess up, so you're not staring at an unsolvable grid for twenty minutes.
• Clean Vector Graphics: Minimalist design that won't murder your phone battery or lag on older devices.

How to Play Sudoku

Getting started takes five seconds, but finishing a hard puzzle? That's where the real challenge lives.

Selecting Cells and Placing Numbers

You click on an empty cell, then click a number from 1 to 9 to fill it. That's it. The interface highlights the row, column, and 3x3 block you're working in, which helps you scan for duplicates. Desktop players use mouse clicks; mobile players tap directly on the grid. The controls are as straightforward as they come.

Using Notes to Track Possibilities

When you're not sure which number goes where, hit the "Notes" button and mark small candidates inside a cell. This is your scratchpad for working through elimination logic. You'll need this on anything harder than beginner difficulty, trust me. It prevents you from making blind guesses that ruin the entire puzzle.

Completing the Grid Without Mistakes

The game validates your entries automatically. Make a mistake—like putting two 7s in the same row—and you'll get flagged. Your job is to clear the entire 81-cell grid using pure deduction. No timers pressuring you (unless the version you're playing adds one), just you versus the logic puzzle.

Who is Sudoku for?

Perfect for anyone who wants a low-pressure mental workout. If you're the type who solves crosswords during lunch or plays solitaire to unwind, this fits that vibe perfectly. It's not about reflexes or hand-eye coordination—it's about pattern recognition and patience. Great for older players, commuters, or anyone who wants to feel productive while killing time. Kids can play it too, though the easier difficulties might bore experienced puzzlers.

The Gameplay Vibe

It's calm and methodical. There's no music blaring, no explosions, no stress beyond what you create for yourself by second-guessing your logic. The visuals are bare-bones—just a grid, some numbers, and basic color coding (blue for your entries, black for the starting clues). It looks like a mobile game template from 2015, which is fine because Sudoku doesn't need fancy shaders or particle effects. You're here to think, not to be dazzled. The tilt effect in the marketing screenshots is just decoration; the actual grid sits flat and functional.

Technical Check: Saves & Performance

The game saves your progress in your browser's local storage, so you can close the tab and come back later without losing your puzzle. Just don't clear your cache and cookies unless you want to start over. Performance-wise, this runs on basically anything—old laptops, budget smartphones, even tablets from five years ago. It's a Unity web build with minimal resource demands. No lag, no stuttering, just instant responsiveness.

Quick Verdict: Pros & Cons

It's Sudoku. If you like Sudoku, you'll like this. If you don't, nothing here will convert you.

• ✅ Pro: Instant play with no downloads or sign-ups required.
• ✅ Pro: The notes feature works exactly as it should—simple and useful.
• ❌ Con: Zero personality. It's functional but forgettable, like a generic store-brand puzzle book.

Controls

Responsive and no-nonsense. Point, click, done.

• Desktop: Mouse to select cells and numbers. Left-click everything.
• Mobile: Tap to select, tap to fill. The touch targets are big enough that you won't misclick often.

Release Date & Developer

Developed by Sergey and released on April 24, 2025. It's a straightforward implementation of the classic puzzle format with no fancy backstory or branding.