Block Siege | Physics Tower Defense HTML5 Game

Block Siege is a physics-driven tower defense HTML5 game where you build defenses out of real physics blocks instead of placing static towers. Every block has mass, friction, and collision — enemies can knock them down, get crushed by falling debris, or be stopped by a well-built wall. The game combines the strategic depth of tower defense with the unpredictable chaos of physics simulation. Five block types, seven enemy types, four active abilities, a permanent upgrade shop, and 10 campaign waves plus endless survival mode give players deep replayability. Built entirely with vanilla JavaScript, HTML5 Canvas 2D, and the Web Audio API — no frameworks, no build tools required. All graphics are rendered procedurally on canvas and all sound effects are synthesized at runtime, but the game also includes replaceable PNG sprites and MP3 audio files — drop in your own art and sound to reskin the entire game without touching code. The only external dependency is Matter.js, loaded via CDN with a fallback. Features 5 Types — Wood, Stone, Metal, Spike, Cannon with unique physics properties 7 Enemy Types — Goblin, Orc, Troll, Bat, Archer, Shaman, Boss 10 Campaign Waves — Progressive difficulty with boss encounters at waves 5 and 10 Endless Survival Mode — Infinite waves for high-score chasing 4 Active Abilities — Repair, Barrage, Gold Rush, Fortify Permanent Upgrade Shop — upgrades and ability unlocks via persistent gold Real Physics Engine — Matter.js rigid body simulation Procedural Audio — All sound effects generated at runtime, zero audio files required Replaceable Sprites — 57 PNG sprite files; drop in your own art for a full reskin Replaceable Audio — 19 MP3 files (SFX + BGM); swap in your own sounds and music Graceful Fallback — Missing sprite/audio files silently fall back to procedural versions Background Music — BGM loops during build/combat, pauses and resumes with the game Custom Canvas Renderer — Gradients, shadows, particles, damage numbers, screen shake Unified Input — Pointer Events API for mouse + touch + stylus Mobile Responsive — Works on phones and tablets, touch-action optimized Keyboard Shortcuts — 1–5 for blocks, Z/X/C/V for abilities, Enter for wave start Persistent Progression — Wallet gold, upgrades, and inventory saved in localStorage Built-in Tutorial — Step-by-step guide for new players In-Game Settings — Volume slider, mute toggle, difficulty selector, screen shake toggle Animated Loading Screen — Progress bar while assets initialize Fullscreen Support — One-click fullscreen toggle Gameplay Build Phase During the build phase, players spend gold to place physics blocks inside a designated build area. Blocks drop from above and settle with real physics — a poorly supported block will topple. Players must think about weight distribution, structural support, and block placement to create an effective defense. Combat Phase When the player starts a wave, enemies spawn from the left side of the screen and charge toward the castle on the right. Enemies physically collide with blocks — they push, climb, and break through. Blocks can crush enemies when they fall, and cannons auto-fire at the nearest target. The castle takes damage when enemies reach it. Progression Each cleared wave awards a gold bonus. Gold is used to buy blocks during the run and is also added to the player’s persistent wallet. Between runs, players spend wallet gold in the Shop to permanently upgrade block durability and purchase abilities for future runs. Category HTML5 Games Technology Vanilla JavaScript, HTML5 Canvas 2D, Web Audio API, CSS3 Physics Engine Matter.js v0.20.0 (CDN-loaded with fallback) Input Pointer Events API (mouse + touch + stylus) + Keyboard Canvas Resolution 1280×720 (scales responsively) Audio Replaceable MP3/WAV files + procedural Web Audio fallback. Looping BGM with pause/resume support. Sprites 57 replaceable PNG files + procedural Canvas 2D fallback Storage localStorage for wallet, upgrades, and inventory Code Lines ~7,500+ total across all JS files Dependencies Matter.js (CDN, not bundled) Mobile Support Yes — responsive layout, touch-optimized controls Frameworks None — zero build tools, zero frameworks Browser Support Chrome 80+, Firefox 80+, Safari 13+, Edge 80+ Requirements A web server (Apache, Nginx, or any static file server) or local HTTP server for development Internet connection on first load (Matter.js CDN — subsequent loads are cached) Modern browser with HTML5 Canvas 2D, Web Audio API, and ES6 support No server-side processing required — fully client-side Customization Block Siege is designed to be fully reskinnable without touching game code:  

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• Before purchasing, please read the Terms and Conditions & Refund Policy.
• If you have any questions, please first read the FAQs.
• If you haven’t found the answer to your question, please contact us, and we will respond ASAP.
• Please note that any digital products on the website do not contain malicious code, viruses, or advertising. We buy the original files from the developers. We do not sell any products downloaded from other sites.