Terminus Rats - HTML5 Slot Game (Pay Anywhere, Tumbles, Bonus Buy, Mobile Ready)

1.0.0Version
Vanilla JavaScriptFramework
NoUpdate Support
NoTechnical Support

Terminus Rats is a premium-style "pay anywhere" tumble slot set in a subway station, in a single HTML file. It uses no framework and no image files: the symbols, the animated Rat King mascot and the painted station background are all generated in code, and sound and music are synthesised with Web Audio.

Play credits only (social / demo game). It includes no real-money or payment backend, and the Bonus Buy spends play credits only.

Gameplay

  • 6×5 grid, pays anywhere with 8+ matching symbols, and tumbles after every win
  • Fuses ×2 to ×100 multiply the total spin win
  • Free Spins: 4+ trains give 10 spins with a global multiplier that never resets. 3+ trains add 5 spins
  • Bonus Buy (100×) and Super Free Spins (500×, starts at ×50, fuses ×5 minimum)
  • Double Chance ante bet (1.25×) doubles the bonus frequency
  • Theoretical RTP 96.68%, high volatility, max win 10,000×

Polish

  • Loading screen with feature intro, animated mascot, LED tumble display, big-win screens
  • Turbo, autoplay, bet picker, separate sound and music toggles, session timer, full rules with per-mode RTP
  • Responsive on desktop, tablet and phone

Easy to customise

The paytable, symbol weights, fuse distribution, buy prices and max win sit in the PAYS / MATH objects at the top of the engine. A README is included.

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airkaze
airkaze Starter · since Oct 2026
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