Tetris Clone HTML5 JavaScript Game Template

A complete Tetris clone / falling-blocks arcade game engine built with plain HTML, CSS, and JavaScript.

No frameworks. No build tools. No dependencies. Just browser-ready source code you can open, edit, reskin, upload, or build from.

Developer Version Included

The template is organized in a clean developer-friendly structure with separated HTML, CSS, JavaScript, background music, and documentation files.

• index.html
• css/falling-blocks.css
• js/falling-blocks-engine.js
• assets/bgm/
• assets/bgm/playlist.js
• DEVELOPER_TEMPLATE_NOTES.md

Core Features

• Complete HTML5 Canvas falling-blocks gameplay
• Tetris clone / Tetris-like arcade puzzle game foundation
• Plain HTML, CSS, and JavaScript
• No Unity, Unreal, npm, Node, Vite, Webpack, or build process required
• Responsive desktop and mobile layout
• Fixed internal canvas rendering for stable scaling
• Keyboard controls for desktop
• Touch and on-screen controls for mobile
• Move, rotate, soft drop, hard drop, hold, pause, and restart
• Hold piece support
• Next-piece queue
• Ghost piece support
• Score, best score, level, lines, and combo tracking
• Local best score saving
• Cascade gravity option
• Multiple game mode presets
• Theme packs
• Power-up blocks
• Daily challenge logic
• Objective cards
• Local unlock system
• Particle effects and visual polish
• Generated arcade sound effects
• 2 demo 8-bit style background songs
• Background music playlist support
• Developer audio balancing controls
• Music ducking so sound effects stay audible over music
• Template hooks for integrations and custom extensions

Game Modes Included

The engine includes multiple game mode presets. Each mode adjusts gameplay values such as speed, lock delay, cascade gravity, and power-up frequency.

• Classic: a clean standard falling-blocks experience.
• Cascade: enables cascade gravity for extra chain reactions.
• Speed Run: faster and more aggressive gameplay.
• Relaxed: slower pacing for casual players.
• Chaos: faster action with more frequent power-ups.
• Kids: easier pacing and more forgiving timing.

Theme Packs Included

Theme packs change the block colors, board background, grid tint, stage feel, and panel styling.

• Neon: electric arcade styling.
• Retro: warmer classic arcade colors.
• Candy: reds, greens, pinks, and shiny candy-like blocks.
• Galaxy: purples, blues, pinks, cyan tones, and subtle space styling.
• Glass: darker frosted glass styling.

Power-Ups Included

Power-ups appear inside normal falling blocks as a glowing symbol. When the block locks or is cleared, the power-up triggers.

Bomb

Clears a small area around the block.

Laser

Clears the row.

Slow

Delays gravity briefly and gives a bonus.

Multiplier

Gives a larger score bonus.

Daily Challenge Logic

The daily challenge option uses a deterministic seed based on the current date and selected game mode. The same day and same mode can generate the same piece order, making it useful for daily score attempts, community challenges, social posts, or future leaderboard integrations.

Objective Cards and Unlocks

The engine includes small objective cards that give the player an extra goal during gameplay. Objectives can reward players for clearing lines, reaching combos, using hold, triggering power-ups, reaching score targets, or hitting level targets.

A simple local unlock system is also included for theme rewards. Developers can edit, remove, or expand the unlock conditions in the JavaScript file.

8-Bit Background Music Included

This package includes 2 demo background music tracks made in an 8-bit, NES-inspired arcade style.

The developer version includes background music support through the assets/bgm/ folder and playlist.js file. You can use MP3, OGG, or both.

window.FALLING_BLOCKS_BGM = [
  'assets/bgm/track1.mp3',
  'assets/bgm/track1.ogg',
  'assets/bgm/track2.mp3',
  'assets/bgm/track2.ogg'
];

Sound Effects and Audio Balancing

The game includes generated arcade-style sound effects for movement, rotation, hard drops, locks, line clears, big clears, level ups, UI actions, power-up moments, and game over.

Developers can tune music volume, sound effect volume, slam impact, and music ducking from the config.

bgmVolume: 0.16,

audioBalance: {
  sfxVolume: 1.35,
  slamVolume: 1.2,
  musicDuckVolume: 0.045,
  musicDuckMs: 260
}

Developer Hooks

Template hooks are included so developers can connect the engine to analytics, leaderboards, ads, coupons, email capture, WordPress, WooCommerce, mobile wrappers, or custom client logic.

• onGameStart
• onLineClear
• onLevelUp
• onGameOver
• onPowerupUsed
• onObjectiveComplete
• onThemeUnlocked

Easy To Customize

The main settings are grouped near the top of the JavaScript file. You can quickly edit board size, cell size, speed, scoring, levels, lock delay, hold support, ghost piece support, cascade gravity, power-up chance, objectives, unlocks, theme packs, audio balance, visual effects, and local best score storage.

columns: 10,
rows: 20,
startDropMs: 850,
lockDelayMs: 420,
powerupsEnabled: true,
powerupChance: 0.07,
objectiveCardsEnabled: true

Requirements

This is a browser-based HTML5 JavaScript game template. You do not need a game engine or complicated setup.

• A modern web browser such as Chrome, Edge, Firefox, or Safari
• A code editor if you want to customize the files
• Basic HTML, CSS, and JavaScript knowledge recommended for deeper edits
• A local server or web host recommended for best audio behavior

No Special Software Required

• No Unity
• No Unreal Engine
• No Node.js
• No npm
• No Vite, Webpack, or build tools
• No third-party dependencies

Important Trademark Note

This is an unofficial falling-blocks / Tetris-like game template. It is not affiliated with, endorsed by, or connected to The Tetris Company or any official Tetris brand. The included source code, styling, features, and assets are intended as an editable arcade game template.

Digital Product Notice

This is a digital download with source code access. Because digital files cannot be returned once accessed, all sales are final. Please review the product details before purchase.