Heist of the Century - HTML5 Slot Game (40 Lines, Vault Bonus, Mobile Ready)

1.0.0Version
Vanilla JavaScriptFramework
NoUpdate Support
NoTechnical Support

Heist of the Century is a stylish bank-heist HTML5 slot game in a single HTML file. Every symbol is drawn in SVG and every sound is synthesised with Web Audio, so there are no image files and no build step.

Play credits only (social / demo game). It includes no real-money or payment backend.

Gameplay

  • 5×4 reels, 40 paylines, Mask wild
  • Blueprints meter: collect 20 Blueprints (they carry over between spins) to open the vault
  • Crew trigger: Lockpick + Driver + Demolition + Hacker on screen together also open the vault
  • Vault bonus: crack a secret 4-digit code in 10 dial spins. Each digit opens a drawer (×5, ×15, ×40, jackpot ×250). Two alarms end the heist
  • Theoretical RTP ≈ 96% (1 M simulated spins)

Polish

  • Vault-door cinematic, big-win screens with coin shower, marquee bulbs, animated win lines
  • Autoplay (10/25/50/100), sound toggle, full rules and paytable
  • Optional 3D vault-room background (three.js), with an automatic 2D fallback
  • Built-in demo tools (open vault, force crew, force big win) for showcasing
  • Responsive on desktop, tablet and phone. Space = spin

Easy to customise

The paytable, symbol weights, blueprint goal and vault odds sit in one ENGINE block at the top of the script. A README is included.

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airkaze
airkaze Starter · since Oct 2026
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