Sudoku Online - Free Logic Puzzle Game - Puzzle Game

Seele01-Flash
By Sofia Johnson
Play Sudoku Online for free! Classic 9x9 number puzzle game with multiple difficulty levels, hints, and undo features. Perfect for brain training and relaxation.
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Prompt

MODEL: Seele01-Flash
Please use Three.js to generate a **mobile-first game** with the theme "Sudoku Online". Please read the following detailed game design requirements first, and then generate the code accordingly: ### 1. Assets & Environment * **Visual Style**: Create a clean, "Zen-like" 3D aesthetic. The game board should appear as a floating, slightly elevated plane (like a wooden or heavy paper board) centered in the view. * **Camera & Perspective**: Use a PerspectiveCamera positioned directly above the board but with a slight tilt (approx 15 degrees) to emphasize the 3D nature of the tiles, while maintaining perfect readability. * **Grid Visualization**: * The 9x9 grid must be clearly divided into 3x3 sub-grids using thicker border lines or slight gaps between the sub-grid meshes. * **Cells**: Each cell should be a separate 3D geometry (flat cube). * **Colors**: Use a calming palette. Background: Deep Gradient Blue (mimicking the screenshot). Board: Cream/Off-white. Text: Dark Grey. Highlight: Soft Yellow (for the active row/column/cell). * **Performance**: Use InstancedMesh for the grid cells and numbers to minimize draw calls, ensuring 60fps on mobile devices. Use simple geometries (BoxGeometry) and basic materials (MeshLambertMaterial). ### 2. Audio Requirements * **Background Music (BGM)**: A minimalist, looping ambient track (e.g., soft piano or lo-fi beat) that aids concentration. It should be muted by default or volume-adjustable. * **Sound Effects (SFX)**: * **Select**: A soft "pop" or "click" when tapping a cell. * **Input**: A "pencil scratching paper" sound when placing a number. * **Error**: A subtle, low-pitched thud or buzz if a placed number conflicts with existing rules (optional, depending on difficulty settings). * **Victory**: A gentle, uplifting chime or arpeggio when the puzzle is completed. ### 3. Gameplay Loop * **Initialization**: On start, generate a valid Sudoku solution using a backtracking algorithm, then remove numbers based on a "Difficulty" variable (Easy: remove ~30, Medium: remove ~40, Hard: remove ~50) to create the puzzle. * **Interaction Logic**: 1. **Select**: Player taps a cell on the grid. 2. **Highlight**: The game visually highlights the selected cell, its corresponding row, its corresponding column, and its 3x3 box to help the player see patterns. 3. **Input**: Player taps a number from the UI Number Pad (1-9) to fill the cell. * **Conflict Detection**: If the player enters a number that already exists in the same row, column, or 3x3 box, highlight the conflicting numbers in Red. * **Win Condition**: The game ends when all 81 cells are filled correctly. Trigger a "Game Over" modal with a "Play Again" button. * **Auxiliary Features**: Include an "Undo" stack to revert moves and a "Note/Pencil" mode boolean that allows putting small candidate numbers in a cell (visualized as smaller text). ### 4. Mobile Controls & Interaction * **Screen Orientation**: Portrait mode lock recommended for best grid-to-screen ratio. * **Touch Controls**: * **Grid Interaction**: Raycasting logic for touch events. Detect taps on the 3D board to select the active cell. * **Input UI (Numpad)**: A dedicated HTML overlay or 2D HUD at the **bottom of the screen** (thumb-friendly zone). It must contain buttons for numbers 1-9, plus functional buttons: "Undo", "Erase", and "Note/Pencil". * **Visual Feedback**: * When a number (e.g., '5') is selected or input, *all* other '5's currently on the board should be highlighted (e.g., turn the text blue) to assist searching. * Touch targets for the bottom UI keypad must be at least 48x48 pixels to prevent miss-clicks. * **Haptic Feedback**: Trigger `navigator.vibrate(10)` (light vibration) on every valid number input for tactile confirmation. Do not ask for clarification. Do not request confirmation. Directly execute the generation task based on the given instructions.
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Game Introduction

About Sudoku Online

Sudoku Online is a captivating logic puzzle game that has entertained millions of players worldwide. This classic Japanese number puzzle challenges you to fill a 9x9 grid with digits 1-9, following specific rules that make each puzzle a unique mental exercise. The name "Sudoku" translates to "single digit," perfectly describing the game's elegant simplicity.

This browser-based version brings the timeless puzzle to your fingertips, whether you're on a computer, tablet, or smartphone. With its clean interface and intuitive controls, you can enjoy hours of engaging gameplay without any downloads or installations.

Core Features

Multiple Difficulty Levels

Whether you're a complete beginner or a seasoned Sudoku master, this game caters to all skill levels. Choose from: - Easy : Perfect for newcomers learning the basic strategies - Medium : Ideal for players developing advanced techniques - Hard : Ultimate challenge for expert puzzle solvers

Smart Assistance Tools

The game includes several helpful features to enhance your solving experience: - Hint System : Get strategic guidance when you're stuck - Undo Function : Easily correct mistakes and experiment with different approaches - Note-taking Tags : Mark possible numbers in cells to organize your thinking - Error Detection : Immediate feedback to help you learn from mistakes

Universal Accessibility

Designed for maximum compatibility across all devices: - Works seamlessly on desktop computers and laptops - Optimized for tablets and smartphones - Responsive design adapts to any screen size - No downloads required - play instantly in your browser

Game Rules and Objective

The 9x9 Grid Challenge

Sudoku uses a large 9x9 square divided into nine smaller 3x3 boxes. Some numbers are pre-filled to get you started, and your job is to complete the puzzle by filling in the remaining empty cells.

The Golden Rules

Every valid Sudoku solution must follow three fundamental rules: 1. Row Rule : Each horizontal row must contain digits 1-9 exactly once 2. Column Rule : Each vertical column must contain digits 1-9 exactly once 3. Box Rule : Each 3x3 sub-grid must contain digits 1-9 exactly once

How to Play

Getting Started

  1. Choose Your Difficulty : Select a level that matches your experience
  2. Analyze the Grid : Study the pre-filled numbers to identify patterns
  3. Start Simple : Look for cells where only one number can fit
  4. Use Logic : Apply deductive reasoning to eliminate possibilities
  5. Take Notes : Use the tagging feature to mark potential numbers

Basic Strategies

  • Scanning : Check rows, columns, and boxes for missing numbers
  • Elimination : Remove impossible numbers from empty cells
  • Single Candidate : Find cells with only one possible number
  • Hidden Singles : Locate numbers that can only go in one place

Controls and Navigation

Mouse Controls (Desktop): - Click on any empty cell to select it - Click on numbers 1-9 to fill the selected cell - Right-click to add or remove notes - Use menu buttons for hints, undo, and other functions

Touch Controls (Mobile): - Tap empty cells to select them - Tap number buttons to fill cells - Long press for note-taking mode - Swipe gestures for quick navigation

Cognitive Benefits

Mental Training

Regular Sudoku practice provides numerous cognitive benefits: - Enhanced Concentration : Focus on complex logical relationships - Memory Improvement : Remember number placements and patterns - Problem-Solving Skills : Develop systematic thinking approaches - Stress Relief : Meditative focus that promotes relaxation

Learning Tool

Sudoku serves as an excellent educational resource: - Develops logical reasoning abilities - Improves pattern recognition skills - Enhances mathematical thinking - Builds patience and perseverance

Why Play Sudoku Online

Convenience and Accessibility

Unlike traditional paper puzzles, this online version offers: - Unlimited Puzzles : Never run out of new challenges - Instant Feedback : Know immediately if you make an error - Progress Tracking : Monitor your improvement over time - No Waste : Eco-friendly alternative to paper puzzles

Perfect for Any Schedule

  • Quick Sessions : Solve easy puzzles in just a few minutes
  • Extended Play : Tackle challenging puzzles over multiple sessions
  • Pause and Resume : Your progress is automatically saved
  • Anytime, Anywhere : Play during commutes, breaks, or leisure time

Whether you're looking to sharpen your mind, relax after a long day, or simply enjoy a timeless puzzle game, Sudoku Online delivers an engaging and rewarding experience that grows with your skills.

Frequently Asked Questions (FAQ)