Checkers is an HTML5 board game where players can play checkers against a friend on the same device or play against a computer opponent with three difficulty levels. The game also includes a 500-level progression mode with gradually increasing AI difficulty, a coin-based shop for unlocking board and piece themes, sound effects, and automatic progress saving using localStorage.

Key Features

HTML5 game built with HTML, CSS, and JavaScript.
Play against a friend on the same device.
Play against a computer opponent.
Three AI difficulty levels: Easy, Medium, and Hard.
500-level progression mode.
Progressive AI difficulty across the level system.
Legal checkers moves and mandatory captures are supported.
Multiple jumps are supported when a capture sequence continues.
Coin system with rewards for completing levels.
In-game shop for unlocking board themes and piece themes.
Multiple board and piece appearance options.
Daily free coin reward.
Sound effects for moves, captures, king promotion, and interface actions.
Automatic progress saving using localStorage.
Responsive interface designed for different screen sizes.
Touch and mouse-friendly controls.
Clean and organized source code.
Easy to customize.
Well documented.
Uses locally included assets and does not require external plugins.
Works directly in modern web browsers.

Technical Requirements & Compatibility

Technology Stack: The game is built entirely with vanilla JavaScript, HTML5, and CSS3. No JavaScript frameworks or libraries (such as React, Vue, Angular, or jQuery) are used. No build tools, bundlers, transpilers, or package managers are required. The source consists of plain .html, .css, and .js files that can be opened and edited in any text editor and run directly in a browser without any compilation step.

Supported Browsers: The game is compatible with all modern evergreen browsers and has been tested on the following:

Google Chrome (latest version)
Mozilla Firefox (latest version)
Apple Safari (macOS and iOS, latest version)
Microsoft Edge (latest version)
Opera (latest version)

Minimum Browser Versions: Chrome 88+, Firefox 87+, Safari 14+, Edge 88+, Opera 74+. Any browser released after 2021 will run the game without issues.

Bundled Assets & Dependencies: All fonts (Cairo), icons (FontAwesome 6), and sound effects (.wav) are included locally inside the project folder. The game does not require any CDN, internet connection, or third-party plugin to function. Once unzipped, it runs completely offline.

Web APIs Used: The game relies only on stable, widely-supported web standards: HTML5 DOM, CSS Grid, Flexbox, localStorage, the HTML5 Audio API, requestAnimationFrame, and standard mouse and touch events. Vendor prefixes (-webkit-) are included for full Safari compatibility. No experimental, deprecated, or preview features are used.

Devices & Resolutions: The responsive layout adapts to desktops, laptops, tablets, and mobile phones in both portrait and landscape orientations. The board scales automatically while preserving its 1:1 aspect ratio. Touch controls are optimized for both phones and tablets, including iPad.

File Structure:

index.html — main HTML markup
style.css — all game styling
script.js — all game logic (vanilla JavaScript, no dependencies)
assets/ — fonts, icons, and sound effects (all bundled locally)
Documentation/documentation.html — full developer documentation

Hosting Note: For sound effects to play correctly, the game should be served over http:// or https:// rather than the file:// protocol. Any simple static server (for example, python3 -m http.server 8080) is sufficient. This is a standard browser security policy and not a limitation of the game itself.

Checkers | 500-Level HTML5 Checkers Game