3 Oaks Gaming connects the base game directly with the main bonus round in Coin Volcano, a compact 3×3 slot featuring a persistent Sticky Coin mechanic.
When a Sticky Coin appears, it remains locked on the grid until the Hold and Win feature begins. Instead of disappearing after one round, the symbol stays visible and contributes to the combination required to activate the bonus.
This gives the base game a clear sense of progression. Players can see that one part of the bonus condition is already in place while waiting for the remaining qualifying symbols to land across the middle row.
Once activated, the Bonus Game begins with three respins. New coin symbols remain locked and occupy the available positions on the grid. Each coin can carry an individual value, while special symbols introduce collection mechanics, mystery outcomes and fixed jackpot prizes.
The Collect Symbol gathers the values currently displayed by the Bonus Coins. Mystery Symbols can reveal additional results, while Mini, Minor and Major Jackpot Symbols may appear directly during the feature.
The Grand Jackpot is connected to filling the entire 3×3 grid. Occupying all nine positions can award a prize of up to 500× the total bet.
Coin Volcano also includes volcanic multiplier events. During the standard Bonus Game, an eruption may place multipliers across the grid. The enhanced Ultra Bonus Game guarantees a Volcano Multiplier Feature at the beginning of the round.
By keeping the Sticky Coin visible before the bonus starts, Coin Volcano creates a direct mechanical link between regular rounds and the Hold and Win feature. The result is a focused slot in which progress can be followed from the first locked coin to the final respin.
