How Coin Volcano works: Hold and Win bonus, step by step

Mechanically, Coin Volcano is a procedure with one branch: spin until three bonus symbols line up, then resolve the bonus. Understanding the game means understanding that branch in detail; everything else on screen is either bookkeeping or decoration. For the product spec (symbols, maths, jackpots) see the fact sheet .

Two ways to run it

The free demo loads the identical build on virtual credits, no account needed. Real-money play runs through a UKGC-licensed casino after registration and age verification. The game behaves the same in both; only the currency is real.

The interface

Three controls matter. The stake selector steps through preset amounts with plus and minus buttons. UK lobbies run from small change up to the legal £5 ceiling. Spin does what it says. Autoplay repeats spins hands-free and, in British versions, requires a loss limit and spin count before it starts: set both deliberately, not at their maximums. Stake strategy and budgets are a separate subject, covered in the how-to-play guide .

The round, start to finish

Base spins show blanks and coins on the 3x3 grid. None of them pays: a Sticky Coin can land and wait, but money only moves in the bonus. Symbols on the active line also fill the Volcano Metre.
Three bonus symbols across the middle row, or a full Volcano Metre, trigger Hold and Win.
Triggering coins lock. You get three re-spins.
Each new coin locks where it lands and resets the counter to three. A Coin Collect symbol, if it appears, sweeps every visible coin and jackpot value at once.
The Volcano Multiplier feature may trigger during re-spins and places one to nine volcano multipliers on grid positions; in the Ultra Bonus Game it is guaranteed.
The round ends when the counter hits zero or the grid fills; a full grid adds the Grand on top. Locked values, times any position multipliers, are totalled and paid.

Where it runs

The game is HTML5, so it runs in any current browser on phone, tablet or computer with no installation, and inside licensed operators’ apps. Device-by-device routes, including the Android APK question, are collected under download .

Play Coin Volcano

Quick start

Open the demo and watch one full bonus round.
Choose an operator via the casino checklist .
Set your stake from your session budget, per the play guide .
If using autoplay, set the loss limit first.
Stop at your pre-set limit, win or lose.

18+. The £5 per-spin cap (£2 at 18-24) applies at every UKGC-licensed operator. BeGambleAware.org; self-exclusion via GAMSTOP.

Frequently Asked Questions

What triggers the bonus round?

Three bonus symbols landing across the middle row, the game’s single payline, or a full Volcano Metre, which fills with symbols on the active line. The Ultra Bonus Game can also trigger at random. There is no scatter, and in British lobbies no purchase route, since Bonus Buy is not permitted under UKGC rules.

How do the re-spins work once the bonus starts?

Triggering coins lock in place and you receive three re-spins. Every new coin that lands also locks and resets the counter to three, so the round continues while coins keep arriving. It ends when the counter reaches zero or every position on the 3x3 grid is occupied.

Is the demo mechanically identical to real play?

Yes, same build, same 95.66% return model, same trigger logic, with virtual credits instead of money. It is the correct place to watch a full bonus round before staking anything.