📖 Detailed Explanation
The Hold and Win bonus game in Coin Volcano slot is triggered by landing 3 bonus symbols (often depicted as volcano icons or coin symbols) anywhere in the middle row of the 3x3 grid during the base game.
This activation causes the volcano to erupt, locking the triggering symbols in place as sticky coins while awarding 3 initial respins. The middle row symbols become fixed, and any new coin, multiplier, jackpot, or mystery symbols landing on empty positions reset the respin counter to 3, allowing players to fill the grid for bigger payouts.
Key details from the mechanics include:
- Sticky Coins: Triggering symbols (with values like 5x-9x bet) remain locked; new ones add to the total win.
- Mystery Symbols: Transform into jackpots (Mini, Minor, Major) or coin values at round's end.
- Coin Collect Symbol (burning volcano vent): Gathers all visible coins and jackpots for instant boosts.
- Volcano Multipliers: Randomly apply 2x-5x to the total bonus win, potentially multiple times.
- Ultra Bonus: Triggered by filling the entire middle row or collecting 3 additional bonus symbols, granting extra spins and higher potential.
The bonus ends when no new symbols land after 3 respins or the full 3x3 grid fills, awarding the Grand Jackpot (up to 500x bet) in the latter case. All payouts occur exclusively in this mode, emphasizing its high-volatility appeal on the 3 Oaks (Booongo) title with 96.5% RTP.
Players note the base game focuses on building toward this feature, with no traditional paylines—strategy involves timing bets for volatility assessment.