📖 Detailed Explanation
In the Coin Volcano slot by 3 Oaks Gaming, the bonus round (Hold & Win feature) features several key symbol types that land on the 3x3 grid during the 3 respins.
- Coin symbols: These sticky coins award values between 5x and 9x the bet (or 0.5x to 4x in some descriptions), remaining on the grid and accumulating total wins. They reset the respin counter to 3 each time a new one lands.
- Jackpot symbols: Include Mini (10x bet), Minor (20x bet), Major (50x bet), and Grand (up to 500x bet). Collecting three identical ones pays the jackpot; filling the entire grid awards Grand.
- Mystery symbols: Transform into any bonus symbol except sticky coins at the round's end, boosting chances for prizes.
- Mystery Jackpot symbols: Reveal only Mini, Minor, or Major jackpots.
- Bonus symbols (volcano icons): Three additional ones grant +3 respins (Ultra Bonus).
Only blanks or these bonus symbols appear, with respins resetting on new landings. Random Volcano Multipliers (2x-5x) can apply to coins or total wins, and eruptions upgrade multipliers on positions. Sticky coins from the base game may carry over, enhancing payouts. The round ends when respins exhaust or the grid fills. This mechanic focuses on accumulation without paylines, maximizing thrill in the volcanic theme.