No paylines. No base game wins. Just coins, jackpots, and a volcano waiting to erupt. Coin Volcano 2 by 3 Oaks Gaming drops the regular symbol paytable entirely, giving players a 3×5 grid where nothing pays until three symbols land on the middle row and trigger the Hold and Win Bonus Game.
The expanded grid is the headline upgrade from its 3×3 predecessor. Where the original held 9 positions, this version runs to 15, with more room for coins to accumulate and a max win raised to 5,000x. The free play demo is the ideal place to get a feel for the rhythm of the main game, where the real action is building toward the bonus rather than watching reels spin for wins that never come.
Coin Volcano 2 sits within 3 Oaks’ growing Hold and Win series, which began with the original Coin Volcano (3×3, max win 2,551x) and took a detour through 3 Coin Volcanoes before this sequel brought the format back to its roots with a significantly larger playing field. The Boost Bonus Game, accessible only via the Buy Bonus option, is new to this entry and distinguishes it from both predecessors.
Sticky Coins can appear at random during standard play. Each carries a prize value of 5x–9x the total bet and remains frozen to its position until the Bonus Game or Ultra Bonus Game is triggered. A bet change removes all current Sticky Coins from the grid, and any Sticky Coins present when a bonus is purchased do not carry into that purchased session.
Landing any three symbols on the centre row starts the Bonus Game with 3 re-spins. Every new symbol that lands resets the counter back to 3. The round ends when the counter runs down to zero or all 15 positions are filled. Filling all 15 awards the Grand Jackpot regardless of what types of symbol occupy those positions.
Standard coins pay 0.5x–4x the total bet. Jackpot coins award fixed values: Mini at 10x, Minor at 20x, and Major at 50x. Filling all 15 positions adds the Grand Jackpot of 500x on top of all accumulated prizes rather than replacing them.
The Mystery symbol transforms into any bonus symbol at the end of the round. The Mystery Jackpot variant has a narrower range and can only resolve into Mini, Minor or Major jackpot coins — the Grand is excluded. Both symbol types reveal one by one when the bonus concludes.
When a Coin Collect symbol lands, it immediately gathers all coin and jackpot values visible on the grid. Any Volcano Multipliers active at that moment are applied to those prizes before collection. After collecting, the Coin Collect symbol sticks to the reels for the remainder of the bonus.
This triggers randomly during both the Bonus Game and Ultra Bonus Game. Each Volcano Multiplier adds x1 to the value of its cell, and multiple hits on the same position stack. Multipliers are applied to coin prizes at the end of the bonus round rather than per symbol as they land.
The Ultra Bonus Game can trigger at random during standard play. It follows the same Hold and Win structure as the regular Bonus Game but comes with a guaranteed Volcano Multipliers Feature at the start, and re-triggers of that feature occur at a higher rate than in the standard version.
Available only through Buy Bonus in eligible regions, the Boost Bonus Game provides the same guaranteed Volcano Multipliers as the Ultra version but with a key difference: each Volcano Multiplier adds x5 to its cell rather than x1. The minimum multiplier obtained during a Boost session is x5.
The paytable is dynamic and adjusts its displayed values to match the selected bet. There is no traditional symbol pay table, as all prizes come exclusively from the Bonus Game or Ultra Bonus Game. Three buy-in tiers are available in regions where bonus purchase is permitted.
The four fixed jackpots scale with the total bet and pay out at the following rates.
| Jackpot | Value |
|---|---|
| Mini | 10x total bet |
| Minor | 20x total bet |
| Major | 50x total bet |
| Grand | 500x total bet |
The Grand Jackpot requires a full 15-position fill and is added to the accumulated bonus total, not paid in place of it. Standard coins pay 0.5x–4x the bet. Sticky Coins award 5x–9x. The maximum potential across a fully multiplied Boost Bonus session reaches 5,000x.
